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Supplemental Oil and Gas Disclosures (Unaudited) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Results of Operations for Producing Activities Detail [Table] |  |  |
Oil and gas sales revenues | $ 2,438 | $ 4,722 | $ 5,560
Production (lifting) costs | 921 | 2,002 | 2,637
Depreciation, depletion, and amortization | 0 | 30 | 37
Excess decommissioning and abandonment costs | 2,665 | 73,194 | 75,313
Accretion expense | $ 1,375 | 130 | 87
Gain on insurance recoveries |  | (6) | (5,685)
Pretax income (loss) from producing activities | $ (2,523) | (70,628) | (66,829)
Income tax expense (benefit) | 0 | 0 | (23,390)
Results of oil and gas producing activities | $ (2,523) | $ (70,628) | $ (43,439)

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