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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES    
Net (loss) income $ (74,968) $ 74,307
Adjustments to reconcile net (loss) income to net cash provided by operating activities    
Provision for doubtful accounts (6) 0
Depreciation, depletion and amortization 65,151 63,787
Impairment 4,170 2,977
Debt issuance costs amortization 235 195
Amortization of premiums and discounts on debt (47) (153)
Gain on extinguishment of debt (1,151) 0
Loss (gain) on derivative contracts 48,434 (57,726)
Cash (paid) received on settlement of derivative contracts (17,393) 2,706
Stock-based compensation 21,909 9,654
Other (1,563) 379
Changes in operating assets and liabilities 11,346 7,806
Net cash provided by operating activities 56,117 103,932
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures for property, plant and equipment (95,328) (88,904)
Acquisition of assets 0 (48,236)
Proceeds from sale of assets 13,563 14,756
Net cash used in investing activities (81,765) (122,384)
CASH FLOWS FROM FINANCING ACTIVITIES    
Repayments of borrowings (36,304) 0
Debt issuance costs 0 (1,488)
Cash paid for tax withholdings on vested stock awards (7,376) (2,891)
Net cash used in financing activities (43,680) (4,379)
NET DECREASE IN CASH, CASH EQUIVALENTS and RESTRICTED CASH (69,328) (22,831)
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year 101,308 174,071
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period 31,980 151,240
Supplemental Disclosure of Noncash Investing and Financing Activities    
Change in accrued capital expenditures 20,631 (8,340)
Equity issued for debt $ 0 $ (268,779)