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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Cash Flows from Operating Activities:            
Net Income (Loss) $ 64,704 $ 2,319 $ 80,757 $ 10,787    
Adjustments to reconcile net income to net cash provided by operating activities -            
Depreciation, depletion, and amortization 24,029 13,096 45,834 26,228    
Accretion of asset retirement obligation 86 84 168 243 $ 419  
Deferred income taxes     (20,732) 328    
Stock-based compensation expenses     3,339 2,675    
Loss (gain) on derivatives     (20,903) 17,107    
Cash settlements on derivatives     4,381 (1,935)    
Settlements of asset retirement obligations     (47) (144)    
Other Noncash Income (Expense)     1,160 3,374    
(Increase) decrease in accounts receivable and other current assets     13,411 2,332    
Increase (decrease) in accounts payable and accrued liabilities     (6,928) (8,439)    
Increase (decrease) in accrued interest     (180) 491    
Net Cash Provided by (Used in) Operating Activities     100,260 53,047    
Cash Flows from Investing Activities:            
Additions to property and equipment     (174,138) (84,097)    
Proceeds from the sale of property and equipment     (96) 26,924    
Payments on property sale obligations     (2,840) (6,042)    
Net Cash Provided by (Used in) Investing Activities     (177,074) (63,215)    
Cash Flows from Financing Activities:            
Proceeds from bank borrowings     227,000 122,300    
Payments of bank borrowings     (149,000) (113,300)    
Net proceeds from issuances of common stock     0 708    
Purchase of treasury shares     (318) (418)    
Payments of debt issuance costs     0 (317)    
Net Cash Provided by (Used in) Financing Activities     77,682 8,973    
Net increase (decrease) in Cash, Cash Equivalents and Restricted Cash     868 (1,195)    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents $ 3,333 $ 6,831 3,333 6,831 $ 2,465 $ 8,026
Supplemental Disclosures of Cash Flows Information:            
Cash paid during period for interest, net of amounts capitalized     17,128 10,926    
Changes in capital accounts payable and capital accruals     (16,521) 35,299    
Increase (decrease) in other long-term liabilities for capital expenditures     $ 0 $ (2,500)