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Equity-Based Compensation Equity-Based Compensation - Performance and Market Based RSUs (Details) - Performance and Market-based Restricted Stock Units - $ / shares
6 Months Ended
Jun. 30, 2016
Units  
Outstanding at beginning of year - shares 249,560
Granted - shares 108,650
Attained by performance - shares 97,017
Vested and released - shares (234,517)
Forfeited - shares (9,000)
Outstanding at end of year - shares 211,710
Maximum potential units outstanding at June 30, 2016 - shares 437,420
Weighted Average Grant Date Fair Value  
Beginning of year - weighted average fair value $ 14.59
Granted - weighted average fair value 13.56
Attained by performance - weighted average fair value 10.48
Vested and released - weighted average fair value 10.52
Forfeited - weighted average fair value 17.14
End of year - weighted average fair value 16.58
Maximum potential units outstanding at June 30, 2016 - weighted average fair value $ 16.63