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Stock-based Compensation - Management Unit Awards - Activity (Details) - Management Unit Awards
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Units  
Unvested at the beginning of the period (in shares) | shares 90,762
Vested (in shares) | shares (43,377)
Unvested at the end of the period (in shares) | shares 47,385
Weighted Average Grant Date Fair Value per Share  
Unvested at the beginning of the period (in dollars per share) $ 15.00
Granted (in dollars per share) 15.00
Forfeited (in dollars per share) 15.00
Vested (in dollars per share) 15.00
Unvested at the end of the period (in dollars per share) $ 15.00