Condensed Financial Information of Registrant - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 68,309	$ 126,015
Restricted cash	2,000	2,413
Total cash, cash equivalents, and restricted cash	70,309	128,428	$ 75,819	$ 119,077
Prepaid and other current assets	24,648	59,156
Total current assets	636,469	1,032,174
Property, plant, and equipment
Property, plant, and equipment	1,183,878	1,146,983
Less accumulated depreciation, depletion, and amortization	(251,113)	(185,040)
Property, plant, and equipment, net	932,765	961,943
Long-term assets
Operating lease right-of-use (“ROU”) assets	357,166	420,073
Other long-term assets	60,572	21,997
Total assets	2,133,861	2,700,560	1,460,734
Current liabilities
Current maturities of long-term debt	59,933	12,297
Accounts payable	106,945	162,402
Accrued taxes	27,440	30,813
Operating lease liabilities	56,965	79,999
Other accrued liabilities	199,628	84,744
Total current liabilities	878,680	1,034,322
Long-term liabilities
Long-term debt, net of current maturities	648,660	599,634
Common stock warrants	0	8,206
Finance lease liabilities	7,925	6,227
Operating lease liabilities	304,355	340,909
Other liabilities	47,967	63,020
Total liabilities	1,887,587	2,052,318
Stockholders’ equity
Preferred stock, $0.01 par value: 3,000,000 shares authorized, none issued	0	0
Common stock, $0.01 par value; 500,000,000 shares authorized at December 31, 2020 and December 31, 2019, 54,002,538 shares and 53,254,151 shares issued at December 31, 2020 and December 31, 2019, respectively	540	533
Additional paid-in capital	726,504	715,069
Accumulated deficit	(477,028)	(67,942)
Accumulated other comprehensive income (loss)	(3,742)	582
Total stockholders’ equity	246,274	648,242	512,329	447,719
Total liabilities and stockholders’ equity	2,133,861	2,700,560
Parent Company
Current assets
Cash and cash equivalents	480	6,309
Restricted cash	330	743
Total cash, cash equivalents, and restricted cash	810	7,052	$ 29,444	$ 66,359
Prepaid and other current assets	16,983	12,325
Due from subsidiaries	107,995	180,686
Total current assets	125,788	200,063
Property, plant, and equipment
Property, plant, and equipment	21,477	20,961
Less accumulated depreciation, depletion, and amortization	(14,368)	(12,117)
Property, plant, and equipment, net	7,109	8,844
Long-term assets
Operating lease right-of-use (“ROU”) assets	3,714	4,276
Investment in subsidiaries	209,010	636,742
Other long-term assets	723	1,128
Total assets	346,344	851,053
Current liabilities
Current maturities of long-term debt	47,301	0
Accounts payable	2,401	2,597
Accrued taxes	49	0
Operating lease liabilities	750	698
Other accrued liabilities	10,907	14,591
Due to subsidiaries	33,757	125,778
Total current liabilities	95,165	143,664
Long-term liabilities
Long-term debt, net of current maturities	0	44,783
Common stock warrants	0	8,206
Finance lease liabilities	77	223
Operating lease liabilities	4,783	5,629
Other liabilities	45	306
Total liabilities	100,070	202,811
Stockholders’ equity
Preferred stock, $0.01 par value: 3,000,000 shares authorized, none issued	0	0
Common stock, $0.01 par value; 500,000,000 shares authorized at December 31, 2020 and December 31, 2019, 54,002,538 shares and 53,254,151 shares issued at December 31, 2020 and December 31, 2019, respectively	540	533
Additional paid-in capital	726,504	715,069
Accumulated deficit	(477,028)	(67,942)
Accumulated other comprehensive income (loss)	(3,742)	582
Total stockholders’ equity	246,274	648,242
Total liabilities and stockholders’ equity	$ 346,344	$ 851,053