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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash Flows from Operating Activities:    
Net Income including non-controlling interest $ 2,791 $ 2,704
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, amortization and accretion on discounted liabilities 18,550 15,832
Gain on sale of properties (1,689) (2,657)
Unrealized loss on derivative instruments, net 2,890 5,957
Provision for deferred income taxes 706 961
Changes in operating assets and liabilities:    
Accounts receivable (1,887) 3,174
Due to related parties (5) 6
Other assets 160 620
Accounts payable 3,887 (12,042)
Accrued liabilities (11,664) (7,121)
Net Cash Provided by Operating Activities 13,739 7,434
Cash Flows from Investing Activities:    
Capital expenditures (11,412) (18,709)
Proceeds from sale of properties and equipment 1,693 2,112
Net Cash Used in Investing Activities (9,719) (16,597)
Cash Flows from Financing Activities:    
Purchase of stock for treasury (3,012) (3,696)
Purchase of non-controlling interests (256) (10)
Proceeds from long-term bank debt and other long-term obligations 13,000 35,300
Repayment of long-term bank debt and other long-term obligations (17,246) (25,428)
Net Cash (Used in) Provided by Financing Activities (7,514) 6,166
Net (Decrease) Increase in Cash and Cash Equivalents (3,494) (2,997)
Cash and Cash Equivalents at the Beginning of the Period 6,315 8,438
Cash and Cash Equivalents at the End of the Period 2,821 5,441
Supplemental Disclosures:    
Income taxes paid 130 4,341
Interest paid $ 2,015 $ 1,950