Summary of Significant Accounting Policies - Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Other Current Liabilities:
Accrued interest payable	$ 88,484	$ 88,614
Accrued taxes other than income	84,755	86,755
Accrued incentive compensation	50,894	51,224
Current portion of long-term capacity contracts	39,589	57,440
Current portion of lease liabilities	35,449	27,972
Other accrued liabilities	42,320	60,407
Total other current liabilities	$ 341,491	$ 372,412