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Condended Financial Information of Registrant Statements of Cash Flow (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 19,005 | $ 18,824 | $ 7,006 | $ 27,786 | $ 13,687 | $ (27,761) | $ (13,088) | $ (18,673) | $ 72,621 | $ (45,835) | $ (39,911)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion, and amortization |  |  |  |  |  |  |  |  | 45,989 | 31,617 | 19,918
Non-cash interest expense |  |  |  |  |  |  |  |  | 7,276 | 18,121 | 12,449
Change in value of common stock warrants |  |  |  |  |  |  |  |  | 1,674 | (2,962) | 3,664
Deferred taxes |  |  |  |  |  |  |  |  | (1,321) | (7,935) | (16,489)
Stock-based compensation |  |  |  |  |  |  |  |  | 7,204 | 6,625 | 5,165
Equity in losses (income) of subsidiaries |  |  |  |  |  |  |  |  | (18,369) | 22,381 | 55,983
Loss on termination of financing agreements |  |  |  |  |  |  |  |  | 8,633 | 0 | 19,669
Net changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Prepaid and other assets |  |  |  |  |  |  |  |  | 37,645 | 447 | (35,697)
Accounts payable and other accrued liabilities |  |  |  |  |  |  |  |  | (33,780) | (26,698) | (26,188)
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | 106,483 | (23,891) | 132,358
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Change in restricted cash |  |  |  |  |  |  |  |  | 502 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | (31,708) | (24,833) | (22,345)
Net cash used in investing activities |  |  |  |  |  |  |  |  | (31,171) | (286,243) | (114,205)
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of offering costs |  |  |  |  |  |  |  |  | 0 | 49,044 | 76,056
Proceeds from borrowings |  |  |  |  |  |  |  |  | 616,706 | 354,682 | 208,158
Repayments of borrowings |  |  |  |  |  |  |  |  | (603,770) | (202,165) | (227,212)
Payment of deferred loan costs |  |  |  |  |  |  |  |  | (10,064) | (6,892) | (7,335)
Other financing activities, net |  |  |  |  |  |  |  |  | (993) | (598) | (995)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (4,751) | 190,118 | 60,425
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 70,561 | (120,016) | 78,578
Cash and cash equivalents at beginning of period |  |  |  | 47,772 |  |  |  | 167,788 | 47,772 | 167,788 | 89,210
Cash and cash equivalents at end of period | 118,333 |  |  |  | 47,772 |  |  |  | 118,333 | 47,772 | 167,788
Net cash received (paid) for: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | (23,873) | (13,217) | (6,891)
Taxes |  |  |  |  |  |  |  |  |  | (589) | (402)
Non-cash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  |  |  |  | 2,926 | 4,907 | 2,102
Value of warrants and debt reclassified to equity |  |  |  |  |  |  |  |  | 0 | 3,084 | 7,691
Capital lease additions |  |  |  |  |  |  |  |  | 165 | 1,575 | 216
Parent Company |  |  |  |  |  |  |  |  |  |  |
Cash flows from operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 72,621 | (45,835) | (39,911)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities: |  |  |  |  |  |  |  |  |  |  |
Depreciation, depletion, and amortization |  |  |  |  |  |  |  |  | 2,871 | 2,205 | 962
Non-cash interest expense |  |  |  |  |  |  |  |  | 5,617 | 13,722 | 6,860
Non-cash interest income from subsidiary |  |  |  |  |  |  |  |  | 0 | (583) | (1,000)
Change in value of common stock warrants |  |  |  |  |  |  |  |  | 1,674 | (2,962) | 3,644
Deferred taxes |  |  |  |  |  |  |  |  | 0 | (8,573) | 0
Stock-based compensation |  |  |  |  |  |  |  |  | 7,204 | 2,226 | 3,202
Equity in losses (income) of subsidiaries |  |  |  |  |  |  |  |  | (111,162) | 17,170 | 5,137
Loss on termination of financing agreements |  |  |  |  |  |  |  |  | 1,804 | 0 | 0
Net changes in operating assets and liabilities: |  |  |  |  |  |  |  |  |  |  |
Prepaid and other assets |  |  |  |  |  |  |  |  | (2,568) | 25 | (8,466)
Accounts payable and other accrued liabilities |  |  |  |  |  |  |  |  | 3,088 | 381 | 3,674
Net cash provided by (used in) operating activities |  |  |  |  |  |  |  |  | (18,851) | (22,224) | (25,898)
Cash flows from investing activities: |  |  |  |  |  |  |  |  |  |  |
Investments in subsidiaries |  |  |  |  |  |  |  |  | (2,072) | (264,163) | (89,603)
Distributions from subsidiaries |  |  |  |  |  |  |  |  | 70,645 | 9,047 | 68,418
Note receivable from subsidiary |  |  |  |  |  |  |  |  | 0 | 10,000 | 0
Change in restricted cash |  |  |  |  |  |  |  |  | 2 | 0 | 0
Capital expenditures |  |  |  |  |  |  |  |  | (5,366) | (4,321) | (4,461)
Due to (from) subsidiaries |  |  |  |  |  |  |  |  | 80,762 | (23,947) | 27,627
Net cash used in investing activities |  |  |  |  |  |  |  |  | 143,971 | (273,384) | 1,981
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of common stock, net of offering costs |  |  |  |  |  |  |  |  | 0 | 49,044 | 76,056
Proceeds from borrowings |  |  |  |  |  |  |  |  | 0 | 172,282 | 7,378
Repayments of borrowings |  |  |  |  |  |  |  |  | (68,873) | (63,062) | (37,214)
Payment of deferred loan costs |  |  |  |  |  |  |  |  | 0 | (6,298) | (307)
Due to (from) subsidiaries |  |  |  |  |  |  |  |  | 0 | 63,578 | 0
Other financing activities, net |  |  |  |  |  |  |  |  | (993) | (598) | (1,087)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (69,866) | 214,946 | 44,826
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  | 55,254 | (80,662) | 20,909
Cash and cash equivalents at beginning of period |  |  |  | $ 10,361 |  |  |  | $ 91,023 | 10,361 | 91,023 | 70,114
Cash and cash equivalents at end of period | $ 65,615 |  |  |  | $ 10,361 |  |  |  | 65,615 | 10,361 | 91,023
Net cash received (paid) for: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | (7,856) | (4,557) | (4,709)
Taxes |  |  |  |  |  |  |  |  | (1,478) | 0 | 51
Non-cash investing and financing activities: |  |  |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  |  |  |  | 370 | 361 | 417
Value of warrants and debt reclassified to equity |  |  |  |  |  |  |  |  | 0 | 3,084 | 7,691
Capital lease additions |  |  |  |  |  |  |  |  | $ 165 | $ 1,575 | $ 216

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- Definition Amount of interest income earned from interest bearing assets classified as other. + References No definition available. + Details
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- Definition The amount of cash paid for interest during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=51831255 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=51831270 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The cash outflow for loan origination associated cost which is usually collected through escrow. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of a controlling interest in another entity or an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
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- Definition The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow (outflow) from financing activities classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3098-108585 + Details
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- Definition The cash inflow from a loan, supported by a promissory note, granted to related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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