The amount of cash deposits released on settlement of derivative instrument during the period.

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Amount of cash released from restriction made earlier on net proceeds from notes issued.

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Average redemption price of debt instrument.

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Percentage of basis points added related to an expense incurred on debt.

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Percentage of outstanding long-term debt or borrowing associated with any securities or credit agreement for which there has been a default in principal, interest, sinking fund, or redemption provisions, or any breach of covenant that existed at the end of the period and subsequently has not been cured.

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Amount of minimum debt to be redeemed through proceeds from sale of assets.

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Amount of net proceeds from offering used for debt redemption.

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Original amount of debt instrument at time of issuance.

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The percentage of principal amount on which additional interest is accrued.

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Percentage of proceeds used for repurchase of the debt.

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Amount of accrued interest redeemed on debt redemption.

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Amount of settlement payment made on debt redemption.

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Percentage of principal amount of debt repurchased in cash.

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Percentage of principal amount of debt repurchased.

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Amount of net proceeds after offering cost of debt that is restricted.

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Amount of net proceeds after offering cost of debt that is unrestricted.

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The minimum percentage of aggregate principal amount of debt to be held by holders to exercise redemption option.

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Number of sale of data center facilities.

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Amount of cash outflow for payment of basis point fee.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Long-term debt: (Details)								3 Months Ended		6 Months Ended		12 Months Ended
Long-term debt: (Details)	Feb. 05, 2026 USD ($)	Jun. 17, 2025 USD ($)	Jun. 04, 2025 USD ($)	Apr. 11, 2025 USD ($)	Jun. 15, 2024	Jun. 11, 2024 USD ($)	May 02, 2024 USD ($)	Jun. 30, 2026 USD ($) Center	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) Center	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($)	Jun. 29, 2026	Jun. 22, 2022 USD ($)	May 07, 2021 USD ($)
Long-term debt
Proceeds from sale of property, plant, and equipment, net of tax								$ 168,000,000
Number of sale of data center facilities \| Center								10		10
Restricted cash								$ 185,971,000		$ 185,971,000		$ 56,597,000
Future net proceeds										7,000,000
Target amount of net proceeds from data center sales										175,000,000
Lease payments										23,007,000	$ 16,523,000
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]												us-gaap:SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Interest rate swap
Long-term debt
Interest rate (as a percent)												3.50%
Net liability												$ 4,300,000
Payment for settlement	$ 4,100,000
Cash Deposits Released	$ 4,300,000
Interest rate swap \| Restricted cash
Long-term debt
Margin deposits												4,100,000
Interest rate swap \| Unrestricted cash
Long-term debt
Margin deposits												200,000
Interest rate swap \| Location, Statement of Financial Position, Balance [Axis]: us-gaap:AccruedLiabilitiesCurrent
Long-term debt
Net liability												4,100,000
Senior secured 2032 notes
Long-term debt
Face amount		$ 600,000,000						579,600,000		579,600,000		579,600,000
Original amount of debt								600,000,000		600,000,000
Senior notes outstanding												600,000,000
Repayments of debt								19,300,000
Aggregate principal amount								20,400,000		20,400,000
Average redemption price								91.955
Gain on debt extinguishment and redemption								$ 1,579,000		$ 1,579,000
Debt instrument, Basis point fee								0.125%		0.125%
Payment of basis point fee								$ 500,000
Consolidated secured leverage ratio								4		4
Percentage of debt instrument, proceeds used for repurchase								50.00%
Minimum debt to be redeemed through proceeds from sale of assets								$ 175,000,000		$ 175,000,000
Net proceeds held as restricted cash								168,000,000		168,000,000
Restricted cash								$ 147,600,000		$ 147,600,000
Interest rate (as a percent)		6.50%
Proceeds from issuance of secured debt		$ 597,800,000									597,842,000
Repurchase price in cash, percentage										100.00%
Minimum percentage of principal amount entitled for redemption										90.00%
Debt costs											2,200,000
Senior secured 2032 notes \| Minimum
Long-term debt
Consolidated secured leverage ratio								1		1			1
Percentage of principal amount considered as default debt								25.00%		25.00%
Consolidated leverage ratio								1		1
Senior secured 2032 notes \| Maximum
Long-term debt
Consolidated secured leverage ratio								4.75		4.75			4
Consolidated leverage ratio								6		6
Senior secured 2032 notes \| Redemption of some or all the notes
Long-term debt
Repurchase price, percentage of principal amount repurchased										100.00%
Senior secured 2032 notes \| Issuers may redeem up to 40% of notes
Long-term debt
Repurchase price, percentage of principal amount repurchased										40.00%
Redemption price percentage										106.50%
Senior secured 2032 notes \| Redemption after July 1, 2028
Long-term debt
Repurchase price, percentage of principal amount repurchased										103.25%
Senior secured 2032 notes \| Change in control accompanied by certain rating events
Long-term debt
Repurchase price, percentage of principal amount repurchased										101.00%
2026 Notes
Long-term debt
Face amount															$ 500,000,000
Aggregate principal amount			$ 500,000,000
Gain on debt extinguishment and redemption									$ (5,606,000)		(5,606,000)
Interest rate (as a percent)		3.50%
Redemption value		$ 500,000,000
Amount of net proceeds from offering			507,300,000
Amount of settlement payment			5,000,000
Amount of accrued interest redeemed			2,200,000
Loss on extinguishment & redemption of 2026 notes			$ 5,600,000
2027 Mirror Notes
Long-term debt
Face amount						$ 300,000,000		$ 300,000,000		$ 300,000,000		300,000,000
Interest rate (as a percent)								7.00%		7.00%
Proceeds from issuance of secured debt										$ 291,900,000
Minimum percentage of principal amount entitled for redemption						90.00%
Percentage of face value								98.50%		98.50%
Lease payments										$ 114,600,000
2027 Mirror Notes \| Minimum
Long-term debt
Percentage of principal amount considered as default debt						25.00%
2027 Mirror Notes \| Redemption of some or all the notes
Long-term debt
Redemption price percentage of principal amount redeemed					103.50%
2027 Mirror Notes \| If certain events have occurred
Long-term debt
Repurchase price, percentage of principal amount repurchased					101.00%
2027 Mirror Notes \| If certain events have not occurred
Long-term debt
Repurchase price in cash, percentage						100.00%
2027 Notes
Long-term debt
Face amount								$ 450,000,000		$ 450,000,000		450,000,000		$ 450,000,000
Interest rate (as a percent)								7.00%		7.00%
Proceeds from issuance of secured debt										$ 446,000,000
Discount on issuance of debt										2,700,000
Debt costs										$ 1,300,000
2027 Notes \| June 15, 2024 to June 14, 2025
Long-term debt
Redemption price percentage of principal amount redeemed										103.50%
Existing IPv4 Notes
Long-term debt
Face amount							$ 206,000,000	$ 206,000,000		$ 206,000,000		206,000,000
Interest rate (as a percent)							7.924%
Proceeds from issuance of secured debt							$ 198,400,000
Maturity date							May 31, 2054
Additional interest accrued on percentage of principal amount							5.00%
Existing IPv4 Notes \| Base Rate
Long-term debt
Debt instrument basis spread on variable rate										5.00%
Existing IPv4 Notes \| US Treasury (UST) Interest Rate
Long-term debt
Debt instrument basis spread on variable rate										3.40%
IPv4 New Notes
Long-term debt
Face amount				$ 174,400,000								174,400,000
Interest rate (as a percent)				6.646%
Proceeds from issuance of secured debt				$ 170,500,000
Debt instrument restricted value				72,600,000
Debt instrument unrestricted value				$ 97,900,000
Restriction on restricted cash										$ 14,200,000		26,900,000
Maturity date				Apr. 30, 2055
Additional interest accrued on percentage of principal amount				5.00%
Percentage of noteholders voting rights to amend covenants				50.00%
IPv4 New Notes \| Base Rate
Long-term debt
Debt instrument basis spread on variable rate				5.00%
IPv4 New Notes \| US Treasury (UST) Interest Rate
Long-term debt
Debt instrument basis spread on variable rate				3.00%
IPv4 New Notes \| Issuance Of Additional Class Notes \| Minimum
Long-term debt
Consolidated leverage ratio				1			1
IPv4 New Notes \| Issuance Of Additional Class Notes \| Maximum
Long-term debt
Consolidated leverage ratio				7.25			6.1
IPv4 New Notes \| Substitute New Ipv4 Addresses \| Minimum
Long-term debt
Consolidated leverage ratio				1			1
IPv4 New Notes \| Substitute New Ipv4 Addresses \| Maximum
Long-term debt
Consolidated leverage ratio				7.25			6.1
IPv4 New Notes \| Dispose Of Ipv Addresses Owned By Ipv Issuer Member Dispose Of Ipv Addresses Owned By Ipv Issuer \| Minimum
Long-term debt
Consolidated leverage ratio				1			1
IPv4 New Notes \| Dispose Of Ipv Addresses Owned By Ipv Issuer Member Dispose Of Ipv Addresses Owned By Ipv Issuer \| Maximum
Long-term debt
Consolidated leverage ratio				7.25			7.1
Secured IPv4 notes
Long-term debt
Face amount							$ 380,400,000
Restricted cash								$ 38,400,000		38,400,000		$ 52,500,000
Proceeds from issuance of secured debt											170,479,000
Debt costs										$ 4,000,000	$ 7,600,000