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