Condensed Financial Information of Registrant - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ 728,642	$ 364,189	$ (81,297)
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation and amortization	119,830	99,769	94,241
Non-cash interest expense	4,645	4,218	5,663
Loss (gain) on sale of assets, net	(59)	(169)	(64,697)
Stock-based compensation	11,633	9,353	8,165
Equity in losses (income) of subsidiaries	(24,985)	0	0
Net changes in operating assets and liabilities:
Prepaid and other assets	(82,027)	(35,356)	(6,321)
Accounts payable, other accrued liabilities, and operating lease ROU assets and liabilities	15,428	262,882	209,565
Net cash provided by (used in) operating activities	579,156	452,606	(27,622)
Cash flows from investing activities:
Capital expenditures	(82,277)	(53,025)	(29,533)
Net cash provided by (used in) investing activities	(659,039)	(87,308)	74,628
Cash flows from financing activities:
Proceeds from sale of common stock, net of offering costs	0	0	87,193
Proceeds from borrowings	1,462,850	384,874	186,773
Repayments of borrowings	(1,317,709)	(446,863)	(329,315)
Purchase of common stock for retirement	(67,821)	(7,834)	(2,145)
Exercise of stock options	17,129	6,444	58
Other financing activities, net	1,646	(412)	862
Net cash provided by (used in) financing activities	(135,597)	13,407	(1,094)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(215,480)	378,705	45,912
Cash, cash equivalents, and restricted cash at beginning of period	494,926	116,221	70,309
Cash, cash equivalents, and restricted cash at end of period	279,446	494,926	116,221
Net cash received (paid) for:
Interest	77,417	63,323	65,221
Taxes	6,099	51	795
Non-cash investing and financing activities:
Accrued capital expenditures	13,241	5,418	8,177
ROU assets obtained in exchange for new finance lease liabilities	7,896	594	1,936
ROU assets obtained in exchange for new operating lease liabilities	72,219	64,567	97,011
Parent Company
Cash flows from operating activities:
Net income (loss)	728,642	364,189	(81,297)
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation and amortization	1,618	2,131	2,452
Non-cash interest expense	0	0	1,364
Loss (gain) on sale of assets, net	30	27	15
Stock-based compensation	11,633	9,353	8,165
Equity in losses (income) of subsidiaries	(759,528)	(388,008)	63,649
Net changes in operating assets and liabilities:
Prepaid and other assets	(2,541)	13,436	1,318
Accounts payable, other accrued liabilities, and operating lease ROU assets and liabilities	1,113	2,651	(1,380)
Net cash provided by (used in) operating activities	(19,033)	3,779	(5,714)
Cash flows from investing activities:
Investments in subsidiaries	(76,000)	0	(146,056)
Distributions from subsidiaries	167,181	0	90,183
Capital expenditures	(1,849)	(1,311)	(1,126)
Due to (from) subsidiaries	(13,408)	5,645	29,752
Net cash provided by (used in) investing activities	75,924	4,334	(27,247)
Cash flows from financing activities:
Proceeds from sale of common stock, net of offering costs	0	0	87,193
Proceeds from borrowings	0	0	12,364
Repayments of borrowings	0	(9,319)	(62,111)
Purchase of common stock for retirement	(67,821)	(7,834)	(2,145)
Exercise of stock options	17,129	6,444	58
Other financing activities, net	1,631	1,058	1,208
Net cash provided by (used in) financing activities	(49,061)	(9,651)	36,567
Net increase (decrease) in cash, cash equivalents, and restricted cash	7,830	(1,538)	3,606
Cash, cash equivalents, and restricted cash at beginning of period	2,878	4,416	810
Cash, cash equivalents, and restricted cash at end of period	10,708	2,878	4,416
Net cash received (paid) for:
Interest	0	(3)	(1,230)
Taxes	(5,902)	(15)	27
Non-cash investing and financing activities:
Accrued capital expenditures	136	372	131
ROU assets obtained in exchange for new finance lease liabilities	0	0	0
ROU assets obtained in exchange for new operating lease liabilities	$ 8,161	$ 0	$ 165