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Condensed Consolidated Statement of Equity (Parenthetical) - shares
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Repurchase of common stock, shares 107,565 101,207
Treasury Stock [Member]    
Repurchase of common stock, shares 107,565 101,207
Total Stockholders' Equity - PrimeEnergy [Member]    
Repurchase of common stock, shares 107,565 101,207