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Condensed Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash Flows from Operating Activities:    
Net Income including non-controlling interest $ 7,013 $ 26,294
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 23,715 23,821
Gain on sale of properties (3,168) (42,078)
Unrealized loss (gain) on derivative instruments, net 8,151 (3,092)
Provision for deferred income taxes 2,363 10,425
Changes in operating assets and liabilities:    
Accounts receivable 2,162 (2,922)
Due to related parties (35) 31
Other assets 376 (1,164)
Accounts payable (14,000) 1,337
Accrued liabilities (1,030) 8,771
Net Cash Provided by Operating Activities 25,547 21,423
Cash Flows from Investing Activities:    
Capital expenditures (29,317) (40,057)
Proceeds from sale of properties and equipment 2,623 46,977
Net Cash (Used in) Provided by Investing Activities (26,694) 6,920
Cash Flows from Financing Activities:    
Purchase of stock for treasury (6,300) (5,000)
Purchase of non-controlling interests (10) (60)
Proceeds from long-term bank debt and other long-term obligations 42,800 52,000
Repayment of long-term bank debt and other long-term obligations (36,112) (67,521)
Distributions to non-controlling interests   (4,410)
Net Cash Provided by (Used in) Financing Activities 378 (24,991)
Net (Decrease) increase in Cash and Cash Equivalents (769) 3,352
Cash and Cash Equivalents at the Beginning of the Period 8,438 6,568
Cash and Cash Equivalents at the End of the Period 7,669 9,920
Supplemental Disclosures:    
Income taxes paid 4,340 2,588
Interest paid $ 2,761 $ 1,762