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Consolidated Statement of Equity (Parenthetical) - shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Repurchase of common stock, shares 72,839 92,824
Treasury Stock [Member]    
Repurchase of common stock, shares 72,839 92,824
Total Stockholders' Equity - PrimeEnergy [Member]    
Repurchase of common stock, shares 72,839 92,824