Condensed Financial Information of Registrant - Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net income (loss)	$ (81,297)	$ (409,086)	$ 40,809
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation, depletion, and amortization	94,241	90,036	86,121
Debt extinguishment and commitment costs	8,144	0	11,587
Non-cash interest expense	5,663	6,902	9,118
Change in value of common stock warrants	0	(4,270)	3,199
Loss (gain) on sale of assets, net	(64,697)	0	0
Stock-based compensation	8,165	7,342	6,437
Equity in losses (income) of subsidiaries	0	46,905	89,751
Net changes in operating assets and liabilities:
Trade accounts receivable	(83,955)	117,801	(36,652)
Prepaid and other assets	(10,885)	29,465	(24,121)
Accounts payable, other accrued liabilities, and operating lease ROU assets and liabilities	209,565	67,193	68,969
Net cash provided by (used in) operating activities	(27,622)	(37,214)	105,630
Cash flows from investing activities:
Capital expenditures	(29,533)	(63,522)	(83,920)
Net cash provided by (used in) investing activities	74,628	(63,464)	(353,229)
Cash flows from financing activities:
Proceeds from sale of common stock, net of offering costs	87,193	0	0
Proceeds from borrowings	186,773	250,387	510,906
Repayments of borrowings	(329,315)	(159,489)	(241,336)
Payment of deferred loan costs	(346)	(6,266)	(13,450)
Exercise of stock options	0	0	8,171
Other financing activities, net	(879)	(428)	582
Net cash provided by (used in) financing activities	(1,094)	42,559	300,208
Net increase (decrease) in cash, cash equivalents, and restricted cash	45,912	(58,119)	52,609
Cash, cash equivalents, and restricted cash at beginning of period	70,309	128,428	75,819
Cash, cash equivalents, and restricted cash at end of period	116,221	70,309	128,428
Net cash received (paid) for:
Interest	65,221	54,256	58,250
Taxes	795	(190)	136
Non-cash investing and financing activities:
Accrued capital expenditures	8,177	4,686	6,386
ROU assets obtained in exchange for new finance lease liabilities	1,936	3,476	963
ROU assets obtained in exchange for new operating lease liabilities	97,011	22,529	79,382
Common stock issued for business combination	0	0	36,980
Common stock issued to repurchase convertible notes	0	0	74,290
Parent Company
Cash flows from operating activities:
Net income (loss)	(81,297)	(409,086)	40,809
Adjustments to reconcile net income (loss) to cash used in operating activities:
Depreciation, depletion, and amortization	2,452	2,900	2,969
Debt extinguishment and commitment costs	0	0	6,091
Non-cash interest expense	1,364	2,518	4,600
Change in value of common stock warrants	0	(4,270)	3,199
Loss (gain) on sale of assets, net	15	0	0
Stock-based compensation	8,165	7,342	6,437
Equity in losses (income) of subsidiaries	63,649	394,197	(81,097)
Net changes in operating assets and liabilities:
Trade accounts receivable	0	0	0
Prepaid and other assets	1,318	(4,253)	1,592
Accounts payable, other accrued liabilities, and operating lease ROU assets and liabilities	(1,380)	(187)	(8,441)
Net cash provided by (used in) operating activities	(5,714)	(10,839)	(23,841)
Cash flows from investing activities:
Investments in subsidiaries	(146,056)	0	0
Distributions from subsidiaries	90,183	4,113	16,673
Capital expenditures	(1,126)	(1,296)	(1,829)
Due to (from) subsidiaries	29,752	5,768	(6,519)
Proceeds from sale of assets	0	14	31
Net cash provided by (used in) investing activities	(27,247)	8,599	8,356
Cash flows from financing activities:
Proceeds from sale of common stock, net of offering costs	87,193	0	0
Proceeds from borrowings	12,364	14,437	63,406
Repayments of borrowings	(62,111)	(18,603)	(76,323)
Payment of deferred loan costs	0	0	(252)
Exercise of stock options	0	0	8,171
Payments for debt extinguishment and commitment costs	0	0	(1,899)
Other financing activities, net	(879)	164	(10)
Net cash provided by (used in) financing activities	36,567	(4,002)	(6,907)
Net increase (decrease) in cash, cash equivalents, and restricted cash	3,606	(6,242)	(22,392)
Cash, cash equivalents, and restricted cash at beginning of period	810	7,052	29,444
Cash, cash equivalents, and restricted cash at end of period	4,416	810	7,052
Net cash received (paid) for:
Interest	(1,230)	(2,475)	(5,357)
Taxes	27	(28)	(220)
Non-cash investing and financing activities:
Accrued capital expenditures	131	233	497
ROU assets obtained in exchange for new finance lease liabilities	0	173	198
ROU assets obtained in exchange for new operating lease liabilities	165	0	134
Common stock issued for business combination	0	0	36,980
Non-cash contribution to subsidiary for business combination	0	0	(36,980)
Common stock issued to repurchase convertible notes	$ 0	$ 0	$ 74,290