Notional amount of debt swapped for fixed interest rates.

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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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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

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Amount, after accumulated amortization, of debt discount (premium).

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- Definition

Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of the fee for available but unused credit capacity under the credit facility.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Debt - Summary (Details) $ in Thousands			12 Months Ended
Debt - Summary (Details) $ in Thousands	Sep. 15, 2025	Mar. 25, 2024 extension	Dec. 31, 2025 USD ($) extension extention Rate	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Feb. 05, 2026	Jun. 13, 2025	Feb. 20, 2025	Sep. 10, 2024 extention
Debt Instrument [Line Items]
Principal outstanding			$ 3,254,315	$ 3,029,135
Long term debt			3,266,099	3,038,322
Total unamortized deferred financing fees and debt issuance costs			$ (11,665)	(9,060)
Weighted average interest rate \| Rate			4.21%
Commitment fee amount			$ 1,000,000
Remaining borrowing capacity			$ 734,800
Minimum
Debt Instrument [Line Items]
Commitment fee percentage			0.10%
Maximum
Debt Instrument [Line Items]
Commitment fee percentage			0.30%
Interest Rate Swaps
Debt Instrument [Line Items]
Derivative notional amount swapped			$ 1,025,000
Interest Expense [Member]
Debt Instrument [Line Items]
Commitment fee amount			1,761	1,765	$ 1,759
Accounts Payable and Accrued Liabilities [Member]
Debt Instrument [Line Items]
Interest payable			$ 11,900	13,700
Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Stated interest rate			3.688%
Daily Simple Secured Overnight Financing Rate SOFR
Debt Instrument [Line Items]
Stated interest rate			3.87%
Unsecured credit facility:
Debt Instrument [Line Items]
Principal outstanding			$ 262,000	409,000
Maturity Date			Sep. 07, 2029
Unsecured Term Loan A
Debt Instrument [Line Items]
Maturity Date			Mar. 15, 2027
Unsecured Term Loan F
Debt Instrument [Line Items]
Maturity Date			Mar. 23, 2029
Number of extensions \| extension		2	2
Extension period		1 year	1 year
Unsecured Term Loan F \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
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Interest rate margin (as a percent)			0.85%
Unsecured Term Loan G
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Extension period			1 year
Series D Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate								4.32%
Maturity Date			Feb. 20, 2025
Series G Unsecured Notes
Debt Instrument [Line Items]
Stated interest rate							4.10%
Maturity Date			Jun. 13, 2025
Series B Unsecured Notes
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Maturity Date			Jul. 01, 2026
Series C Unsecured Notes
Debt Instrument [Line Items]
Maturity Date			Dec. 30, 2026
Series E Unsecured Notes
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Maturity Date			Feb. 20, 2027
Series H Unsecured Notes
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Maturity Date			Jun. 13, 2028
Series L Unsecured Notes
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Maturity Date			May 28, 2029
Series O Unsecured Notes
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Maturity Date			Jun. 25, 2030
Series M Unsecured Notes
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Maturity Date			May 28, 2031
Series I Unsecured Notes
Debt Instrument [Line Items]
Maturity Date			Sep. 29, 2031
Series K Unsecured Notes
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Maturity Date			Jun. 28, 2032
Series P Unsecured Notes
Debt Instrument [Line Items]
Maturity Date			Jun. 25, 2033
Series J Unsecured Notes
Debt Instrument [Line Items]
Maturity Date			Sep. 28, 2033
Series N Unsecured Notes
Debt Instrument [Line Items]
Maturity Date			May 28, 2034
Series Q Unsecured Notes
Debt Instrument [Line Items]
Maturity Date			Jun. 25, 2035
United of Omaha Life Insurance Company
Debt Instrument [Line Items]
Maturity Date			Oct. 01, 2039
Term Loans A,G, H and I \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate margin (as a percent) \| Rate			0.85%
Unsecured credit facility:
Debt Instrument [Line Items]
Principal outstanding			$ 262,000	409,000
Interest rate margin (as a percent) \| Rate			0.775%
Maximum borrowing capacity			$ 1,000,000
Number of extensions \| extention			2						2
Extension period			6 months
Unsecured credit facility: \| Subsequent Event \| Scenario, Plan
Debt Instrument [Line Items]
Stated interest rate						3.94%
Unsecured credit facility: \| Prepaid Expenses and Other Assets
Debt Instrument [Line Items]
Total unamortized deferred financing fees and debt issuance costs			$ (7,300)	(10,100)
Unsecured credit facility: \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Interest rate margin (as a percent)			0.775%
Unsecured Term Loans
Debt Instrument [Line Items]
Long term debt			$ 1,025,000	1,025,000
Total unamortized deferred financing fees and debt issuance costs			(3,659)	(3,152)
Unsecured Term Loans \| Unsecured term loans:
Debt Instrument [Line Items]
Principal outstanding			1,021,341	1,021,848
Unsecured Term Loans \| Unsecured Term Loan A
Debt Instrument [Line Items]
Long term debt			$ 150,000	150,000
Stated interest rate \| Rate			2.06%
Unsecured Term Loans \| Unsecured Term Loan H
Debt Instrument [Line Items]
Long term debt			$ 187,500	187,500
Stated interest rate \| Rate			3.25%
Maturity Date			Jan. 25, 2028
Unsecured Term Loans \| Unsecured Term Loan I
Debt Instrument [Line Items]
Long term debt			$ 187,500	187,500
Stated interest rate \| Rate			3.41%
Maturity Date			Jan. 25, 2028
Unsecured Term Loans \| Unsecured Term Loan F
Debt Instrument [Line Items]
Long term debt			$ 200,000	200,000
Stated interest rate \| Rate			4.73%
Unsecured Term Loans \| Unsecured Term Loan G
Debt Instrument [Line Items]
Long term debt			$ 300,000	300,000
Stated interest rate \| Rate			1.70%
Maturity Date			Mar. 14, 2031
Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 1,975,000	1,600,000
Total unamortized deferred financing fees and debt issuance costs			(8,006)	(5,908)
Unsecured Notes \| Unsecured Term Loan G
Debt Instrument [Line Items]
Stated interest rate	0.125%
Extension period	1 year
Unsecured Notes \| Unsecured notes:
Debt Instrument [Line Items]
Principal outstanding			1,966,994	1,594,092
Unsecured Notes \| Series D Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 0	100,000
Stated interest rate \| Rate			4.32%
Unsecured Notes \| Series G Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 0	75,000
Stated interest rate \| Rate			4.10%
Unsecured Notes \| Series B Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 50,000	50,000
Stated interest rate \| Rate			4.98%
Unsecured Notes \| Series C Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 80,000	80,000
Stated interest rate \| Rate			4.42%
Unsecured Notes \| Series E Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 20,000	20,000
Stated interest rate \| Rate			4.42%
Unsecured Notes \| Series H Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 100,000	100,000
Stated interest rate \| Rate			4.27%
Unsecured Notes \| Series L Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 175,000	175,000
Stated interest rate \| Rate			6.05%
Unsecured Notes \| Series O Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 350,000	0
Stated interest rate \| Rate			5.50%
Unsecured Notes \| Series M Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 125,000	125,000
Stated interest rate \| Rate			6.17%
Unsecured Notes \| Series I Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 275,000	275,000
Stated interest rate \| Rate			2.80%
Unsecured Notes \| Series K Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 400,000	400,000
Stated interest rate \| Rate			4.12%
Unsecured Notes \| Series P Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 100,000	0
Stated interest rate \| Rate			5.82%
Unsecured Notes \| Series J Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 50,000	50,000
Stated interest rate \| Rate			2.95%
Unsecured Notes \| Series N Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 150,000	150,000
Stated interest rate \| Rate			6.30%
Unsecured Notes \| Series Q Unsecured Notes
Debt Instrument [Line Items]
Long term debt			$ 100,000	0
Stated interest rate \| Rate			5.99%
Mortgage Loans Payable
Debt Instrument [Line Items]
Principal outstanding			$ 3,980	4,195
Long term debt			4,099	4,322
Unamortized fair market value discount			(119)	(127)
Mortgage Loans Payable \| United of Omaha Life Insurance Company
Debt Instrument [Line Items]
Long term debt			$ 4,099	$ 4,322
Stated interest rate \| Rate			3.71%