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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities:    
Net Income (Loss) $ 114,656 $ 74,615
Adjustments to reconcile net income to net cash provided by operation activities -    
Depreciation, depletion, and amortization 95,915 68,035
Accretion of asset retirement obligation 329 419
Deferred income taxes (22,101) 1,014
Stock-based compensation expense 6,148 5,980
Gain (Loss) on Sale of Derivatives (24,242) 9,777
Cash Received (Paid) On Settlements of Derivative Contracts 24,631 (19,677)
Asset Retirement Obligation, Cash Paid to Settle (83) (187)
Write off of Deferred Debt Issuance Cost 82 0
Other Noncash Income (Expense) 2,930 5,293
Change in assets and liabilities-    
(Increase) decrease in accounts receivable and other assets 11,605 (20,470)
Increase (decrease) in accounts payable and accrued liabilities (7,100) (2,686)
Increase (decrease) in income taxes payable (519) (53)
Increase (decrease) in accrued interest (116) (593)
Net Cash Provided by Operating Activities 203,173 121,573
Cash Flows from Investing Activities:    
Additions to property and equipment (282,660) (266,532)
Acquisition of properties 0 (1,002)
Proceeds from (adjustments to) the sale of property and equipment (96) 27,673
Payments for (Proceeds from) Other Investing Activities (5,112) (8,740)
Decrease in Restricted Cash 0 (222)
Net Cash Used in Investing Activities (287,868) (248,823)
Cash Flows from Financing Activities:    
Proceeds from bank borrowings 381,000 306,800
Payments of bank borrowings (297,000) (184,800)
Net proceeds from issuances of common stock 0 709
Purchase of treasury shares (412) (418)
Payments of debt issuance costs 0 (602)
Net Cash Provided by (Used in) Financing Activities 83,588 121,689
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect (1,107) (5,561)
Total Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 1,358 2,465
Supplemental Disclosures of Cash Flows Information:    
Cash paid during period for interest, net of amounts capitalized 34,408 24,794
Increase (decrease) in accrued payables for capital (21,584) 45,349
Increase (decrease) in other long-term liabilities for capital expenditures $ 0 $ (5,000)