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Consolidated Statement of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash Flows from Operating Activities:    
Net Income including non-controlling interest $ 2,704 $ 28,184
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 15,832 16,009
Gain on sale of properties (2,657) (41,719)
Unrealized loss (gain) on derivative instruments, net 5,957 (4,354)
Provision for deferred income taxes 938 7,305
Changes in operating assets and liabilities:    
Accounts receivable 3,174 (2,252)
Due to related parties 6 352
Other assets 620 (1,105)
Accounts payable (12,042) (2,647)
Accrued liabilities (7,121) 14,760
Net Cash Provided by Operating Activities 7,434 14,533
Cash Flows from Investing Activities:    
Capital expenditures (18,788) (30,463)
Proceeds from sale of properties and equipment 2,112 46,572
Net Cash (Used in) Provided by Investing Activities (16,597) 16,109
Cash Flows from Financing Activities:    
Purchase of stock for treasury (3,696) (4,605)
Purchase of non-controlling interests (10) (60)
Proceeds from long-term bank debt and other long-term obligations 35,300 42,000
Repayment of long-term bank debt and other long-term obligations (25,428) (66,823)
Net Cash Provided by (Used in) Financing Activities 6,166 (29,488)
Net (Decrease) increase in Cash and Cash Equivalents (2,997) 1,154
Cash and Cash Equivalents at the Beginning of the Period 8,438 6,588
Cash and Cash Equivalents at the End of the Period 5,441 7,222
Supplemental Disclosures:    
Income taxes paid 4,341 2,587
Interest paid $ 1,950 $ 1,356