Annual report pursuant to Section 13 and 15(d)

Equity Based Compensation (Details)

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Equity Based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Number of units      
Total awarded and unvested at the beginning of the period (in shares) 2,381,440    
Granted (in shares) 12,057    
Vested (in shares) (595,595)    
Forfeited (in shares) (130,070)    
Total awarded and unvested at the end of the period (in shares) 1,667,832 2,381,440  
Weighted average grant date fair value      
Total awarded and unvested at the beginning of the period (in dollars per unit) $ 29.00    
Granted (in dollars per unit) 24.88    
Vested (in dollars per unit) 29.00    
Forfeited (in dollars per unit) 29.00    
Total awarded and unvested at the end of the period (in dollars per unit) $ 28.97 $ 29.00  
Aggregate intrinsic value      
Total awarded and unvested at the beginning of the period $ 65,490    
Total awarded and unvested at the end of the period 38,060 $ 65,490  
Additional disclosures      
Equity-based compensation expense $ 22,470 $ 11,618 $ 24,349
Midstream LTIP      
Additional disclosures      
Number of stock-based compensation awards authorized 10,000,000    
Unamortized expense $ 46,100    
Number of shares available for future grant under the Plan 7,947,771    
Weighted average period for recognizing unrecognized stock-based compensation expense 2 years 10 months 24 days    
Various equity based compensation plans | Antero      
Additional disclosures      
Unamortized expense $ 232,000