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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash Flows from Operating Activities:    
Net income $ 3,301 $ 28,009
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 7,923 7,938
Gain on sale of properties (2,472) (41,602)
Unrealized loss (gain) on derivative instruments, net 1,821 (2,804)
Provision for deferred income taxes 905 4,492
Changes in assets and liabilities:    
Decrease (increase) in accounts receivable 4,343 (1,160)
Increase in due from related parties (14)  
Increase in due to related parties 166 386
Decrease (increase) in other assets 243 (152)
Decrease in accounts payable (13,537) (871)
(Decrease) increase in accrued liabilities (4,264) 22,391
Net Cash (Used in) Provided by Operating Activities (1,585) 16,627
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (10,734) (18,866)
Proceeds from sale of properties and equipment 1,816 46,438
Net Cash (Used in) Provided by Investing Activities (8,918) 27,572
Cash Flows from Financing Activities:    
Purchase of stock for treasury (3,379) (25)
Purchase of non-controlling interests   (60)
Proceeds from long-term bank debt and other long-term obligations 27,300  
Repayment of long-term bank debt and other long-term obligations (13,439) (38,672)
Net Cash Provided by (Used in) Financing Activities 10,482 (38,757)
Net (Decrease) increase in Cash and Cash Equivalents (21) 5,442
Cash and Cash Equivalents at the Beginning of the Period 8,438 6,568
Cash and Cash Equivalents at the End of the Period 8,417 12,010
Supplemental Disclosures:    
Income taxes paid 5 200
Interest paid $ 772 $ 451