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Share-Based Compensation - Summary of Incentive Unit Activity and Changes (Details) - Incentive Unit Award
 6 Months Ended
Jun. 30, 2017
$ / shares
shares
Units  
Non-vested at the beginning of the period (in shares) | shares 987,797
Granted (in shares) | shares 4,106
Vested (in shares) | shares (19,124)
Forfeited (in shares) | shares (27,203)
Non-vested at the end of the period (in shares) | shares 945,576
Weighted-Average Grant-Date Fair Value  
Non-vested at the beginning of the period (in dollars per share) | $ / shares $ 12.63
Granted (in dollars per share) | $ / shares 10.96
Vested (in dollars per share) | $ / shares 16.20
Forfeited (in dollars per share) | $ / shares 13.78
Non-vested at the end of the period (in dollars per share) | $ / shares $ 12.51