Long-Term Debt - Outstanding Debt Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Maturities of outstanding debt
2022	$ 97,174
2023	2,081
2024	401,621
2025	401,562
2026	401,481
Thereafter	1,851,503
Total debt	3,155,422	$ 3,158,658
Interest costs
Interest costs incurred	107,700	118,800	$ 132,600
Interest costs incurred capitalized	$ 50,500	$ 23,900	$ 5,500

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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