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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Cash Flows [Abstract]      
Net (loss) income $ (449,305) $ (9,075) $ 47,062
Adjustments to reconcile net (loss) income to net cash provided by operating activities      
Provision for doubtful accounts 16 (462) 406
Depreciation, depletion and amortization 158,558 139,263 131,887
Impairment 409,574 4,170 4,019
Debt issuance costs amortization 558 470 430
Amortization of discount, net of premium, on debt 0 (47) (330)
Gain on extinguishment of debt 0 (1,151) 0
Write off of debt issuance costs 142 0 0
(Gain) loss on derivative contracts (1,094) 17,155 (24,090)
Cash received (paid) on settlement of derivative contracts 6,266 (35,325) 7,260
Stock-based compensation 4,254 23,377 15,750
Other (187) (1,571) 344
Changes in operating assets and liabilities increasing (decreasing) cash      
Receivables 15,829 16,560 115
Prepaid expenses (714) 2,620 127
Other current assets (301) 170 191
Other assets and liabilities, net (610) (1,754) 4,186
Accounts payable and accrued expenses (17,217) (4,257) (2,199)
Asset retirement obligations (4,445) (4,629) (3,979)
Net cash provided by operating activities 121,324 145,514 181,179
CASH FLOWS FROM INVESTING ACTIVITIES      
Capital expenditures for property, plant and equipment (191,678) (187,047) (219,246)
Acquisitions of assets 236    
Acquisitions of assets   (24,764) (48,312)
Proceeds from sale of assets 1,593 28,358 21,834
Net cash used in investing activities (189,849) (183,453) (245,724)
CASH FLOWS FROM FINANCING ACTIVITIES      
Proceeds from borrowings 211,096 10,000 0
Repayments of borrowings (153,596) (46,304) 0
Debt issuance costs (911) 0 (1,488)
Reduction of financing lease liability (1,374) 0 0
Cash paid for tax withholdings on vested stock awards (367) (7,420) (6,730)
Net cash provided by (used in) financing activities 54,848 (43,724) (8,218)
NET DECREASE IN CASH, CASH EQUIVALENTS and RESTRICTED CASH (13,677) (81,663) (72,763)
CASH, CASH EQUIVALENTS and RESTRICTED CASH, beginning of year 19,645 101,308 174,071
CASH, CASH EQUIVALENTS and RESTRICTED CASH, end of year $ 5,968 $ 19,645 $ 101,308