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Stock-based Compensation - Management Unit Awards - Activity (Details) - Management Unit Awards
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Units  
Unvested at the beginning of the period (in shares) | shares 189,355
Granted (in shares) | shares 40,630
Forfeited (in shares) | shares (40,630)
Vested (in shares) | shares (98,593)
Unvested at the end of the period (in shares) | shares 90,762
Weighted Average Grant Date Fair Value per Share  
Unvested at the beginning of the period (in dollars per share) | $ / shares $ 15.00
Granted (in dollars per share) | $ / shares 15.00
Forfeited (in dollars per share) | $ / shares 15.00
Vested (in dollars per share) | $ / shares 15.00
Unvested at the end of the period (in dollars per share) | $ / shares $ 15.00