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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, 2018
$ / shares
shares
Units  
Outstanding at beginning of year - shares | shares 399,347
Granted - shares | shares 74,222
Released - shares | shares (130,634)
Forfeited - shares | shares (1,938)
Outstanding at end of year - shares | shares 340,997
Releasable - shares | shares 194,674
Weighted Average Grant Date Fair Value  
Beginning of year - weighted average fair value | $ / shares $ 14.60
Granted - weighted average fair value | $ / shares 26.31
Converted - weighted average fair value | $ / shares 14.24
Forfeited - weighted average fair value | $ / shares 20.86
End of year - weighted average fair value | $ / shares 17.25
Releasable - weighted average fair value | $ / shares $ 12.82