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Condensed Consolidated Statements of Cash Flows - Unaudited - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash Flows from Operating Activities:    
Net Income (loss) $ 28,184 $ 3,112
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 16,009 11,581
Gain on sale and exchange of assets (41,719) (16,323)
Unrealized loss on derivative instruments, net (4,354)  
Provision (benefit) for deferred income taxes 7,305 493
Changes in assets and liabilities:    
(Increase) decrease in accounts receivable (2,252) 2,533
(Increase) decrease in other current assets and restricted cash (1,105) 521
(Decrease) in accounts payable (2,647) (3,582)
Increase in accrued liabilities 14,760 6,522
Increase in due to related parties 352 36
Net Cash Provided by Operating Activities 14,533 4,893
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (30,463) (12,205)
Proceeds from sale of property and equipment 46,572 16,323
Net Cash Provided by (Used in) Investing Activities 16,109 4,118
Cash Flows from Financing Activities:    
Purchase of stock for treasury (4,605) (509)
Purchase of non-controlling interests (60) (176)
Proceeds from long-term bank debt and other long-term obligations 42,000 9,000
Repayment of long-term bank debt and other long-term obligations (66,823) (8,515)
Net Cash Used in Financing Activities (29,488) (200)
Net Increase (Decrease) in Cash and Cash Equivalents 1,154 8,811
Cash and Cash Equivalents at the Beginning of the Period 6,568 9,750
Cash and Cash Equivalents at the End of the Period 7,722 18,561
Supplemental Disclosures:    
Income taxes paid 2,587  
Interest paid $ 1,356 $ 1,796