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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities:      
Net Income (Loss) $ 121,220 $ (138,225) $ (170,378)
Adjustments to reconcile to net cash provided by operations:      
Depreciation, depletion and amortization 228,480 159,964 171,641
Deferred income taxes 1,827 0 0
Impairment, dry hole costs and abandonment expense 719 49,553 4,249
Commodity derivative (gain) loss (93,349) 9,112 20,720
Settlements of commodity derivatives (47,587) 19,099 95,598
Stock compensation and other non-cash charges 8,337 6,596 8,982
Amortization of deferred financing costs 2,365 2,194 2,834
(Gain) loss on extinguishment of debt 257 8,239 (8,726)
(Gain) loss on sale of properties 1,046 (92) 1,078
Change in operating assets and liabilities:      
Accounts receivable (13,697) (18,578) 10,624
Prepayments and other assets (793) (1,848) 350
Accounts payable, accrued and other liabilities (40,324) 11,690 (2,893)
Amounts payable to oil and gas property owners 34,499 10,402 (9,465)
Production taxes payable 28,441 3,884 (2,878)
Net cash provided by (used in) operating activities 231,441 121,990 121,736
Investing Activities:      
Additions to oil and gas properties, including acquisitions (453,616) (239,631) (106,870)
Additions of furniture, equipment and other (853) (926) (1,195)
Repayment of debt associated with merger, net of cash acquired (53,357) 0 0
Proceeds from sale of properties and other investing activities 143 101,546 24,927
Net cash provided by (used in) investing activities (507,683) (139,011) (83,138)
Financing Activities:      
Proceeds from debt 0 275,000 0
Principal and redemption premium payments on debt (469) (322,343) (440)
Proceeds from sale of common stock, net of offering costs 1 110,710 110,003
Deferred financing costs and other (4,982) (7,721) (1,156)
Net cash provided by (used in) financing activities (5,450) 55,646 108,407
Increase (Decrease) in Cash and Cash Equivalents (281,692) 38,625 147,005
Beginning Cash and Cash Equivalents 314,466 275,841 128,836
Ending Cash and Cash Equivalents $ 32,774 $ 314,466 $ 275,841