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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash Flows from Operating Activities:            
Net Income (Loss) $ 27,651 $ 7,080 $ 108,408 $ 17,867    
Adjustments to reconcile net income to net cash provided by operating activities -            
Depreciation, depletion, and amortization 24,937 18,766 70,771 44,994    
Accretion of asset retirement obligation 88 87 257 330 $ 419  
Deferred income taxes     (19,735) 549    
Stock-based compensation expenses     5,091 4,240    
Loss (gain) on derivatives     (34,312) 30,707    
Cash settlements on derivatives     16,087 (5,671)    
Settlements of asset retirement obligations     (67) (159)    
Other Noncash Income (Expense)     1,782 4,114    
(Increase) decrease in accounts receivable and other current assets     13,746 (6,533)    
Increase (decrease) in accounts payable and accrued liabilities     (8,824) (2,612)    
Increase (Decrease) in Income Taxes Payable     217 0    
Increase (decrease) in accrued interest     (356) 198    
Net Cash Provided by (Used in) Operating Activities     153,065 88,024    
Cash Flows from Investing Activities:            
Additions to property and equipment     (234,859) (163,151)    
Proceeds from the sale of property and equipment     (96) 27,940    
Payments on property sale obligations     (4,402) (7,036)    
Increase in Restricted Cash     0 222    
Net Cash Provided by (Used in) Investing Activities     (239,357) (142,469)    
Cash Flows from Financing Activities:            
Proceeds from bank borrowings     315,000 192,300    
Payments of bank borrowings     (228,000) (141,300)    
Net proceeds from issuances of common stock     0 709    
Purchase of treasury shares     (323) (418)    
Payments of debt issuance costs     0 (330)    
Net Cash Provided by (Used in) Financing Activities     86,677 50,961    
Net increase (decrease) in Cash, Cash Equivalents and Restricted Cash     385 (3,484)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 2,850 $ 4,542 2,850 4,542 $ 2,465 $ 8,026
Supplemental Disclosures of Cash Flows Information:            
Cash paid during period for interest, net of amounts capitalized     26,172 17,620    
Changes in capital accounts payable and capital accruals     (27,905) 54,060    
Increase (decrease) in other long-term liabilities for capital expenditures     $ 0 $ (3,750)