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Equity-Based Compensation - Nonvested Incentive Units (Details) - Incentive Units - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Incentive units outstanding   1 year 11 months 23 days 2 years 10 months 6 days
Number of Nonvested Incentive Units Outstanding (in thousands)      
Outstanding (in shares) 14,835 17,114 7,977
Units awarded (in shares)   2,197 10,444
Units forfeited (in shares) (873) (1,109) (899)
Units vested (in shares) (17,567) (3,367) (408)
Outstanding (in shares) 0 14,835 17,114
Weighted Average Grant Date Fair Value per Incentive Unit      
Units outstanding (in dollars per share) $ 1.34 $ 1.26 $ 1.36
Units awarded (in dollars per share)   2.04 1.18
Units forfeited (in dollars per share) 0.97 1.75 1.26
Units vested (in dollars per share) 3.14 1.24 1.36
Units outstanding (in dollars per share) $ 0.00 $ 1.34 $ 1.26
CEO      
Number of Nonvested Incentive Units Outstanding (in thousands)      
Units awarded (in shares) 7,500    
Units converted (in shares) (4,500)    
Weighted Average Grant Date Fair Value per Incentive Unit      
Units awarded (in dollars per share) $ 11.69    
Units converted (in dollars per share) $ 11.69    
President      
Number of Nonvested Incentive Units Outstanding (in thousands)      
Units awarded (in shares) 1,512    
Units settled (in shares) (624)    
Units converted (in shares) (283)    
Weighted Average Grant Date Fair Value per Incentive Unit      
Units awarded (in dollars per share) $ 1.98    
Units settled (in dollars per share) 1.98    
Units converted (in dollars per share) $ 1.98