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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES    
Net loss $ (18,561) $ (74,968)
Adjustments to reconcile net loss to net cash provided by operating activities    
Provision for doubtful accounts (91) (6)
Depreciation, depletion, and amortization 81,813 65,151
Impairment 0 4,170
Debt issuance costs amortization 238 235
Amortization of premiums and discounts on debt 0 (47)
Write off of debt issuance costs 142 0
Gain on extinguishment of debt 0 (1,151)
Loss on derivative contracts 209 48,434
Cash received (paid) on settlement of derivative contracts 5,078 (17,393)
Stock-based compensation 3,104 21,909
Other (57) (1,563)
Changes in operating assets and liabilities (9,402) 11,346
Net cash provided by operating activities 62,473 56,117
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures for property, plant and equipment (123,676) (95,328)
Acquisition of assets 236 0
Proceeds from sale of assets 852 13,563
Net cash used in investing activities (122,588) (81,765)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from borrowings 112,596 0
Repayments of borrowings (60,596) (36,304)
Reduction of financing lease liability (635) 0
Debt issuance costs (901) 0
Cash paid for tax withholdings on vested stock awards (205) (7,376)
Net cash provided by (used in) financing activities 50,259 (43,680)
NET DECREASE IN CASH, CASH EQUIVALENTS and RESTRICTED CASH (9,856) (69,328)
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year 19,645 101,308
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period 9,789 31,980
Supplemental Disclosure of Cash Flow Information    
Cash paid for interest, net of amounts capitalized (949) 0
Supplemental Disclosure of Noncash Investing and Financing Activities    
Purchase of PP&E in accounts payable 17,224 29,464
Right-of-use assets obtained in exchange for financing lease obligations $ 2,655 $ 0