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Equity-Based Compensation - Summary of Service-Based Restricted Stock Units (Details) - Officers, key employees, and non-employee directors - Service-Based RSUs
9 Months Ended
Sep. 30, 2017
$ / shares
shares
Units  
Outstanding at beginning of year - shares | shares 554,478
Granted - shares | shares 34,040
Released - shares | shares (199,251)
Forfeited - shares | shares (9,924)
Outstanding at end of year - shares | shares 379,343
Releasable - shares | shares 226,811
Weighted Average Grant Date Fair Value  
Beginning of year - weighted average fair value | $ / shares $ 13.37
Granted - weighted average fair value | $ / shares 22.98
Converted - weighted average fair value | $ / shares 13.79
Forfeited - weighted average fair value | $ / shares 16.69
End of year - weighted average fair value | $ / shares 13.92
Releasable - weighted average fair value | $ / shares $ 11.38