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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Cash Flows from Operating Activities:    
Net Income (Loss) $ 74,615 $ 71,971
Adjustments to reconcile net income to net cash provided by operation activities -    
Depreciation, depletion, and amortization 68,035 46,933
Accretion of asset retirement obligation 419 2,322
Deferred income taxes 1,014 0
Stock-based compensation expense 5,980 6,849
Gain (Loss) on Sale of Derivatives 9,777 (17,913)
Cash Received (Paid) On Settlements of Derivative Contracts (19,677) (1,411)
Asset Retirement Obligation, Cash Paid to Settle (187) (2,335)
Write off of Deferred Debt Issuance Cost 0 2,676
Other Noncash Income (Expense) 5,293 (559)
Change in assets and liabilities-    
(Increase) decrease in accounts receivable and other assets (20,470) (7,169)
Increase (decrease) in accounts payable and accrued liabilities (2,686) 6,089
Increase (decrease) in income taxes payable (53) 0
Increase (decrease) in accrued interest (593) 385
Net Cash Provided by Operating Activities 121,573 107,838
Cash Flows from Investing Activities:    
Additions to property and equipment (266,532) (192,982)
Acquisition of properties (1,002) (9,426)
Proceeds from the sale of property and equipment 27,673 702
Payments for (Proceeds from) Other Investing Activities (8,740) 0
Decrease in Restricted Cash (222) 26
Net Cash Used in Investing Activities (248,823) (201,680)
Cash Flows from Financing Activities:    
Proceeds from long-term debt issuances 0 198,000
Proceeds from bank borrowings 306,800 404,700
Payments of bank borrowings (184,800) (529,700)
Net proceeds from issuances of common stock 709 39,179
Purchase of treasury shares (418) (777)
Payments of debt issuance costs (602) (10,031)
Net Cash Provided by (Used in) Financing Activities 121,689 101,371
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect (5,561) 7,529
Total Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 2,465 8,026
Supplemental Disclosures of Cash Flows Information:    
Cash paid during period for interest, net of amounts capitalized 24,794 10,428
Increase (decrease) in accrued payables for capital 45,349 9,894
Increase (decrease) in other long-term liabilities for capital expenditures $ (5,000) $ 5,000