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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Statement of Cash Flows [Abstract]    
Net Income (Loss) Attributable to Parent $ (40,894) $ 50,808
Adjustments to reconcile net (loss) income to net cash provided by operating activities    
Provision for doubtful accounts (335) 0
Depreciation, depletion and amortization 31,150 30,817
Impairment 4,170 2,531
Debt issuance costs amortization 117 78
Amortization of premiums and discounts on debt (47) (75)
Gain on extinguishment of debt (1,151) 0
Loss (gain) on derivative contracts 18,330 (34,183)
Cash paid on settlement of derivative contracts (6,119) (638)
Stock-based compensation 15,872 3,261
Other (235) 360
Changes in operating assets and liabilities 9,549 11,277
Net cash provided by operating activities 30,407 64,236
CASH FLOWS FROM INVESTING ACTIVITIES    
Capital expenditures for property, plant and equipment (65,527) (43,686)
Acquisition of assets 0 (48,073)
Proceeds from sale of assets 955 10,203
Net cash used in investing activities (64,572) (81,556)
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 (1,661) (1,424)
Net cash used in financing activities (37,965) (2,912)
NET DECREASE IN CASH, CASH EQUIVALENTS and RESTRICTED CASH (72,130) (20,232)
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year 101,308 174,071
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of period 29,178 153,839
Supplemental Disclosure of Noncash Investing and Financing Activities    
Change in accrued capital expenditures 28,258 2,954
Equity issued for debt $ 0 $ (268,779)