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Condended Financial Information of Registrant Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 118,333 | $ 47,772 | $ 167,788 | $ 89,210
Restricted cash | 744 | 1,246 |  |
Prepaid and other current assets | 17,279 | 53,380 |  |
Total current assets | 603,544 | 403,108 |  |
Property and equipment |  |  |  |
Total property and equipment | 529,638 | 500,989 |  |
Less accumulated depreciation and depletion | (79,622) | (49,727) |  |
Property, plant and equipment, net | 450,016 | 451,262 |  |
Long-term assets |  |  |  |
Other long-term assets | 32,864 | 46,596 |  |
Total assets | 1,347,407 | 1,145,433 | 892,261 |
Current liabilities |  |  |  |
Accounts payable | 52,543 | 65,190 |  |
Other accrued liabilities | 27,444 | 35,186 |  |
Total current liabilities | 470,952 | 382,765 |  |
Long-term liabilities |  |  |  |
Long-term debt, net of current maturities | 384,812 | 350,110 |  |
Common stock warrants | 6,808 | 5,134 |  |
Long-term capital lease obligations | 1,220 | 1,780 |  |
Total liabilities | 899,688 | 776,524 |  |
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, 2017 and December 31, 2016, 45,776,087 shares and 45,533,913 shares issued at December 31, 2017 and December 31, 2016, respectively | 458 | 455 |  |
Additional paid-in capital | 593,295 | 587,057 |  |
Accumulated deficit | (148,178) | (220,799) |  |
Accumulated other comprehensive income | 2,144 | 2,196 |  |
Total stockholders’ equity | 447,719 | 368,909 |  |
Total liabilities and stockholders’ equity | 1,347,407 | 1,145,433 |  |
Parent Company |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 65,615 | 10,361 | $ 91,023 | $ 70,114
Restricted cash | 744 | 746 |  |
Prepaid and other current assets | 11,768 | 9,200 |  |
Due from subsidiaries | 8,113 | 66,900 |  |
Total current assets | 86,240 | 87,207 |  |
Property and equipment |  |  |  |
Total property and equipment | 15,773 | 10,259 |  |
Less accumulated depreciation and depletion | (6,226) | (3,485) |  |
Property, plant and equipment, net | 9,547 | 6,774 |  |
Long-term assets |  |  |  |
Investment in subsidiaries | 552,748 | 513,693 |  |
Other long-term assets | 1,976 | 1,976 |  |
Total assets | 650,511 | 609,650 |  |
Current liabilities |  |  |  |
Accounts payable | 4,510 | 4,529 |  |
Other accrued liabilities | 12,913 | 8,141 |  |
Due to subsidiaries | 82,524 | 73,529 |  |
Total current liabilities | 99,947 | 86,199 |  |
Long-term liabilities |  |  |  |
Long-term debt, net of current maturities | 95,486 | 148,456 |  |
Common stock warrants | 6,808 | 5,134 |  |
Long-term capital lease obligations | 551 | 952 |  |
Total liabilities | 202,792 | 240,741 |  |
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, 2017 and December 31, 2016, 45,776,087 shares and 45,533,913 shares issued at December 31, 2017 and December 31, 2016, respectively | 458 | 455 |  |
Additional paid-in capital | 593,295 | 587,057 |  |
Accumulated deficit | (148,178) | (220,799) |  |
Accumulated other comprehensive income | 2,144 | 2,196 |  |
Total stockholders’ equity | 447,719 | 368,909 |  |
Total liabilities and stockholders’ equity | $ 650,511 | $ 609,650 |  |

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- Definition Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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