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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Cash Flows from Operating Activities:    
Net income $ 47,434 $ 5,422
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 36,068 30,174
Gain on sale of properties (41,258) (32,378)
Unrealized (gain) loss on derivative instruments (547) 3,582
(Benefit) Provision for deferred income taxes (12,538) 147
Changes in assets and liabilities:    
(Increase) Decrease in accounts receivable (9,561) 2,143
Increase (Decrease) in due from related parties 101 (25)
(Increase) Decrease in inventories (9) 61
(Increase) Decrease in prepaid expenses and other assets (344) 207
Increase (Decrease) in accounts payable 12,650 (390)
Increase in accrued liabilities 8,111 2,062
Net Cash Provided by Operating Activities 40,107 11,005
Cash Flows from Investing Activities:    
Capital expenditures, including exploration expense (59,361) (20,843)
Proceeds from sale of properties and equipment 46,231 35,226
Net Cash (Used in) Provided by Investing Activities (13,130) 14,383
Cash Flows from Financing Activities:    
Purchase of stock for treasury (5,650) (1,093)
Purchase of non-controlling interests (308) (224)
Increase in long-term bank debt and other long-term obligations 64,853 13,500
Repayment of long-term bank debt and other long-term obligations (82,628) (39,910)
Distribution to non-controlling interest (4,917) (843)
Net Cash Used in Financing Activities (28,650) (28,570)
Net Decrease in Cash and Cash Equivalents (1,673) (3,182)
Cash and Cash Equivalents at the Beginning of the Year 10,111 13,293
Cash and Cash Equivalents at the End of the Year 8,438 10,111
Supplemental Disclosures:    
Income taxes paid during the year 414 120
Interest paid during the year $ 2,339 $ 3,476