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Consolidated Statement of Equity (Parenthetical) - shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Purchase of common stock, shares 114,133 21,181
Treasury Stock [Member]    
Purchase of common stock, shares 114,133 21,181
Total Stockholders' Equity - PrimeEnergy [Member]    
Purchase of common stock, shares 114,133 21,181