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Condensed Financial Information of Registrant Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Current assets |  |  |  |
Cash and cash equivalents | $ 126,015 | $ 75,076 |  |
Restricted cash | 2,413 | 743 |  |
Total cash, cash equivalents, and restricted cash | 128,428 | 75,819 | $ 119,077 | $ 49,018
Prepaid and other current assets | 59,156 | 28,370 |  |
Total current assets | 1,032,174 | 586,592 |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 1,146,983 | 649,768 |  |
Less accumulated depreciation, depletion, and amortization | (185,040) | (111,507) |  |
Property, plant, and equipment, net | 961,943 | 538,261 |  |
Long-term assets |  |  |  |
Operating lease assets | 420,073 |  |  |
Other long-term assets | 21,997 | 21,881 |  |
Total assets | 2,700,560 | 1,460,734 | 1,347,407 |
Current liabilities |  |  |  |
Accounts payable | 162,402 | 54,787 |  |
Operating lease liabilities | 79,999 |  |  |
Other accrued liabilities | 84,744 | 54,562 |  |
Total current liabilities | 1,034,322 | 507,201 |  |
Long-term liabilities |  |  |  |
Long-term debt, net of current maturities | 599,634 | 392,607 |  |
Common stock warrants | 8,206 | 5,007 |  |
Finance lease liabilities | 6,227 |  |  |
Finance lease liabilities |  | 6,123 |  |
Operating lease liabilities | 340,909 |  |  |
Other liabilities | 63,020 | 37,467 |  |
Total liabilities | 2,052,318 | 948,405 |  |
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, 2019 and December 31, 2018, 53,254,151 shares and 46,983,924 shares issued at December 31, 2019 and December 31, 2018, respectively | 533 | 470 |  |
Additional paid-in capital | 715,069 | 617,937 |  |
Accumulated deficit | (67,942) | (108,751) |  |
Accumulated other comprehensive income | 582 | 2,673 |  |
Total stockholders’ equity | 648,242 | 512,329 | 447,719 | 368,909
Total liabilities and stockholders’ equity | 2,700,560 | 1,460,734 |  |
Parent Company |  |  |  |
Current assets |  |  |  |
Cash and cash equivalents | 6,309 | 28,701 |  |
Restricted cash | 743 | 743 |  |
Total cash, cash equivalents, and restricted cash | 7,052 | 29,444 | $ 66,359 | $ 11,107
Prepaid and other current assets | 12,325 | 11,711 |  |
Due from subsidiaries | 180,686 | 43,928 |  |
Total current assets | 200,063 | 85,083 |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment | 20,961 | 18,939 |  |
Less accumulated depreciation, depletion, and amortization | (12,117) | (9,034) |  |
Property, plant, and equipment, net | 8,844 | 9,905 |  |
Long-term assets |  |  |  |
Operating lease assets | 4,276 |  |  |
Investment in subsidiaries | 636,742 | 638,975 |  |
Other long-term assets | 1,128 | 3,334 |  |
Total assets | 851,053 | 737,297 |  |
Current liabilities |  |  |  |
Accounts payable | 2,597 | 8,312 |  |
Operating lease liabilities | 698 |  |  |
Other accrued liabilities | 14,591 | 12,349 |  |
Due to subsidiaries | 125,778 | 96,963 |  |
Total current liabilities | 143,664 | 117,624 |  |
Long-term liabilities |  |  |  |
Long-term debt, net of current maturities | 44,783 | 100,411 |  |
Common stock warrants | 8,206 | 5,007 |  |
Finance lease liabilities | 223 |  |  |
Finance lease liabilities |  | 475 |  |
Operating lease liabilities | 5,629 |  |  |
Other liabilities | 306 | 1,451 |  |
Total liabilities | 202,811 | 224,968 |  |
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, 2019 and December 31, 2018, 53,254,151 shares and 46,983,924 shares issued at December 31, 2019 and December 31, 2018, respectively | 533 | 470 |  |
Additional paid-in capital | 715,069 | 617,937 |  |
Accumulated deficit | (67,942) | (108,751) |  |
Accumulated other comprehensive income | 582 | 2,673 |  |
Total stockholders’ equity | 648,242 | 512,329 |  |
Total liabilities and stockholders’ equity | $ 851,053 | $ 737,297 |  |

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