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.

No definition available.

Long-term debt: (Details) - USD ($) $ in Thousands						1 Months Ended			3 Months Ended	6 Months Ended
Long-term debt: (Details) - USD ($) $ in Thousands	Jun. 04, 2025	Apr. 11, 2025	Jun. 15, 2024	Jun. 11, 2024	May 02, 2024	May 31, 2025	Nov. 30, 2024	May 31, 2024	Jun. 30, 2025	Jun. 30, 2025	Oct. 31, 2024	Jun. 30, 2024	Apr. 30, 2024	Jun. 17, 2025	Dec. 31, 2024
Long-term debt
Proceeds from issuance of secured debt		$ 170,500
Loss on debt extinguishment and redemption - 2026 notes	$ 5,600								$ 5,606	$ 5,606
Lease payments										16,523		$ 42,131
Debt Instrument, Restricted Value		72,600
Debt Instrument, Unrestricted Value		$ 97,900
Interest rate swap
Long-term debt
Fair value of interest rate swaps									13,600	13,600					$ 4,000
Interest rate swap \| Restricted cash
Long-term debt
Margin deposits									13,600	13,600
Interest rate swap \| Unrestricted cash
Long-term debt
Margin deposits									200	200
Interest rate swap \| Accrued and other current liabilities
Long-term debt
Fair value of interest rate swaps									22,300	22,300					13,800
Interest rate swap \| Other long-term liabilities
Long-term debt
Fair value of interest rate swaps									18,300	$ 18,300					$ 13,800
SOFR \| Interest rate swap
Long-term debt
Interest rate (as a percent)										3.50%
Payment of debt in Installments						$ 9,700	$ 12,100
Net proceeds						$ 9,700					$ 12,100		$ 12,100
Payment made to counter party								$ 12,100
2027 Mirror Notes
Long-term debt
Face amount				$ 300,000					$ 300,000	$ 300,000
Interest rate (as a percent)				7.00%
Proceeds from issuance of secured debt										$ 291,900
Percentage of face value									98.50%	98.50%
Lease payments										$ 114,600
Maturity date				Jun. 15, 2027
Minimum percentage of principal amount entitled for redemption				90.00%
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				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	$ 450,000
Interest rate (as a percent)									7.00%	7.00%
2026 Notes
Long-term debt
Interest rate (as a percent)									3.50%	3.50%
Aggregate Principal amount	500,000
Amount of net proceeds from offering	507,300
Amount of settlement payment	5,000
Amount of accrued interest redeemed	$ 2,200
Redemption value										$ 500,000
Secured IPv4 notes
Long-term debt
Proceeds from issuance of secured debt										170,479		198,420
Debt costs										4,000		$ 7,600
Secured IPv4 Notes
Long-term debt
Face amount					$ 380,400
Senior secured 2032 notes
Long-term debt
Face amount									$ 600,000	$ 600,000				$ 600,000
Interest rate (as a percent)									6.50%	6.50%				6.50%
Proceeds from issuance of secured debt										$ 597,842
Debt costs										$ 2,200
Repurchase price in cash, percentage										100.00%
Minimum percentage of principal amount entitled for redemption										90.00%
Senior secured 2032 notes \| Minimum
Long-term debt
Percentage of principal amount considered as default debt									25.00%	25.00%
Senior secured 2032 notes \| Redemption of some or all the notes
Long-term debt
Repurchase price, percentage										100.00%
Senior secured 2032 notes \| Issuers may redeem up to 40% of notes
Long-term debt
Redemption price percentage										106.50%
Repurchase price, percentage										40.00%
Senior secured 2032 notes \| Redemption after July 1, 2028
Long-term debt
Repurchase price, percentage										103.25%
Senior secured 2032 notes \| Change in control accompanied by certain rating events
Long-term debt
Repurchase price, percentage										101.00%
Existing IPv4 Notes
Long-term debt
Face amount					$ 206,000				$ 206,000	$ 206,000
Interest rate (as a percent)					7.924%				7.924%	7.924%
Proceeds from issuance of secured debt					$ 198,400
Maturity date					May 31, 2054
Percentage Of Noteholders Voting Rights To Amend Covenants		50.00%
Additional interest accrued on percentage of principal amount					5.00%
Existing IPv4 Notes \| Base Rate [Member]
Long-term debt
Debt Instrument, Basis Spread on Variable Rate										5.00%
Existing IPv4 Notes \| US Treasury (UST) Interest Rate [Member]
Long-term debt
Debt Instrument, Basis Spread on Variable Rate										3.40%
IPv4 New Notes
Long-term debt
Face amount		$ 174,400							$ 174,400	$ 174,400
Interest rate (as a percent)		6.646%							6.646%	6.646%
Maturity date		Apr. 30, 2055
Additional interest accrued on percentage of principal amount		5.00%
IPv4 New Notes \| Base Rate [Member]
Long-term debt
Debt Instrument, Basis Spread on Variable Rate		5.00%
IPv4 New Notes \| US Treasury (UST) Interest Rate [Member]
Long-term debt
Debt Instrument, Basis Spread on Variable Rate		3.00%