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Condensed Financial Information of Registrant Statements of Cash Flow (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 35,439 | $ (83,891) | $ 28,169 | $ 61,092 | $ 13,886 | $ (5,822) | $ 16,178 | $ 15,185 | $ 40,809 | $ 39,427 | $ 72,621
Adjustments to reconcile net income to cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion, and amortization |  |  |  |  |  |  |  |  | 86,121 | 52,642 | 45,989
Non-cash interest expense |  |  |  |  |  |  |  |  | 9,118 | 7,127 | 7,276
Change in value of common stock warrants |  |  |  |  |  |  |  |  | 3,199 | (1,801) | 1,674
Stock-based compensation |  |  |  |  |  |  |  |  | 6,437 | 6,196 | 7,204
Equity in losses (income) of subsidiaries |  |  |  |  |  |  |  |  | 89,751 | (9,464) | (18,369)
Net changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Prepaid and other assets |  |  |  |  |  |  |  |  | (24,121) | (5,521) | 37,645
Accounts payable, other accrued liabilities, and operating lease assets and liabilities |  |  |  |  |  |  |  |  | 68,969 | 19,885 | (33,780)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 105,630 | 90,620 | 106,483
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | (83,920) | (48,439) | (31,708)
Other investing activities |  |  |  |  |  |  |  |  | 864 | 816 | 35
Net cash used in investing activities |  |  |  |  |  |  |  |  | (353,229) | (175,821) | (31,673)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of offering costs |  |  |  |  |  |  |  |  | 0 | 19,318 | 0
Proceeds from borrowings |  |  |  |  |  |  |  |  | 510,906 | 118,741 | 616,706
Repayments of borrowings |  |  |  |  |  |  |  |  | (241,336) | (118,751) | (603,770)
Payment of deferred loan costs |  |  |  |  |  |  |  |  | (13,450) | (379) | (10,064)
Exercise of stock options |  |  |  |  |  |  |  |  | 8,171 | 0 | 0
Payments for debt extinguishment and commitment costs |  |  |  |  |  |  |  |  | (8,087) | (3,390) | (4,432)
Other financing activities, net |  |  |  |  |  |  |  |  | 582 | (860) | (993)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 300,208 | 41,943 | (4,751)
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  |  |  |  |  | 52,609 | (43,258) | 70,059
Cash, cash equivalents, and restricted cash at beginning of period |  |  |  | 75,819 |  |  |  | 119,077 | 75,819 | 119,077 | 49,018
Cash, cash equivalents, and restricted cash at end of period | 128,428 |  |  |  | 75,819 |  |  |  | 128,428 | 75,819 | 119,077
Net cash received (paid) for: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | (58,250) | (28,186) | (23,873)
Taxes |  |  |  |  |  |  |  |  | (136) | (49) | (1,478)
Non-cash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  |  |  |  | 6,386 | 6,199 | 2,926
ROU assets obtained in exchange for new finance lease liabilities |  |  |  |  |  |  |  |  | 963 |  |
ROU assets obtained in exchange for new finance lease liabilities |  |  |  |  |  |  |  |  |  | 1,678 | 165
ROU assets obtained in exchange for new operating lease liabilities |  |  |  |  |  |  |  |  | 79,382 |  |
Common stock issued for business combination |  |  |  |  |  |  |  |  | 36,980 | 0 | 0
Non-cash contribution to subsidiary for business combination |  |  |  |  |  |  |  |  | (36,980) |  |
Common stock issued to repurchase convertible notes |  |  |  |  |  |  |  |  | 74,290 | 0 | 0
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 40,809 | 39,427 | 72,621
Adjustments to reconcile net income to cash used in operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion, and amortization |  |  |  |  |  |  |  |  | 2,969 | 4,092 | 2,871
Non-cash interest expense |  |  |  |  |  |  |  |  | 4,600 | 4,925 | 5,617
Change in value of common stock warrants |  |  |  |  |  |  |  |  | 3,199 | (1,801) | 1,674
Stock-based compensation |  |  |  |  |  |  |  |  | 6,437 | 6,196 | 7,204
Equity in losses (income) of subsidiaries |  |  |  |  |  |  |  |  | (81,097) | (81,942) | (111,162)
Debt extinguishment and commitment costs |  |  |  |  |  |  |  |  | 6,091 | 0 | 1,804
Net changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Prepaid and other assets |  |  |  |  |  |  |  |  | 1,592 | (2,604) | (2,568)
Accounts payable, other accrued liabilities, and operating lease assets and liabilities |  |  |  |  |  |  |  |  | (8,441) | 5,601 | 3,088
Net cash provided by operating activities |  |  |  |  |  |  |  |  | (23,841) | (26,106) | (18,851)
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Investments in subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | (2,072)
Distributions from subsidiaries |  |  |  |  |  |  |  |  | 16,673 | 0 | 70,645
Capital expenditures |  |  |  |  |  |  |  |  | (1,829) | (3,682) | (5,366)
Due to (from) subsidiaries |  |  |  |  |  |  |  |  | (6,519) | (25,102) | 80,762
Other investing activities |  |  |  |  |  |  |  |  | 31 | 0 | 0
Net cash used in investing activities |  |  |  |  |  |  |  |  | 8,356 | (28,784) | 143,969
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of offering costs |  |  |  |  |  |  |  |  | 0 | 19,318 | 0
Proceeds from borrowings |  |  |  |  |  |  |  |  | 63,406 | 10,770 | 0
Repayments of borrowings |  |  |  |  |  |  |  |  | (76,323) | (11,253) | (68,873)
Payment of deferred loan costs |  |  |  |  |  |  |  |  | (252) | 0 | 0
Exercise of stock options |  |  |  |  |  |  |  |  | 8,171 | 0 | 0
Payments for debt extinguishment and commitment costs |  |  |  |  |  |  |  |  | (1,899) | 0 | 0
Other financing activities, net |  |  |  |  |  |  |  |  | (10) | (860) | (993)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (6,907) | 17,975 | (69,866)
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  |  |  |  |  | (22,392) | (36,915) | 55,252
Cash, cash equivalents, and restricted cash at beginning of period |  |  |  | $ 29,444 |  |  |  | $ 66,359 | 29,444 | 66,359 | 11,107
Cash, cash equivalents, and restricted cash at end of period | $ 7,052 |  |  |  | $ 29,444 |  |  |  | 7,052 | 29,444 | 66,359
Net cash received (paid) for: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | (5,357) | (5,750) | (7,856)
Taxes |  |  |  |  |  |  |  |  | (220) | (49) | (1,478)
Non-cash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  |  |  |  | 497 | 714 | 370
ROU assets obtained in exchange for new finance lease liabilities |  |  |  |  |  |  |  |  | 198 |  |
ROU assets obtained in exchange for new finance lease liabilities |  |  |  |  |  |  |  |  |  | 539 | 165
ROU assets obtained in exchange for new operating lease liabilities |  |  |  |  |  |  |  |  | 134 |  |
Common stock issued for business combination |  |  |  |  |  |  |  |  | 36,980 | 0 | 0
Common stock issued to repurchase convertible notes |  |  |  |  |  |  |  |  | $ 74,290 | $ 0 | $ 0

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