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Equity-Based Compensation - Summary of Service-Based Restricted Stock Units (Details 6) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding      
Outstanding at end of year, units 201,900    
Weighted Average Grant Date Fair Value      
End of year, Weighted-average Grant-Date Fair Value $ 16.48    
Directors' Plan      
Summary of Service-Based Restricted Stock Units      
Nonvested at end of period, RSUs, shares 25,985    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding      
Outstanding at beginning of year, units 505,170    
Granted, units 195,266    
Released, units (102,967)    
Forfeited, units (42,991)    
Outstanding at end of year, units 554,478 505,170  
Weighted Average Grant Date Fair Value      
Beginning of year, Weighted-average Grant-Date Fair Value $ 13.13    
Granted, Weighted-average Grant-Date Fair Value 15.07 $ 17.31 $ 9.00
Converted, Weighted-average Grant-Date Fair Value 14.27    
Forfeited, Weighted-average Grant-Date Fair Value 16.75    
End of year, Weighted-average Grant-Date Fair Value 13.37 $ 13.13  
Convertible at end of period, Weighted-average Grant-Date Fair Value $ 11.34    
Released at end of period, RSUs 303,233    
Weighted Average Remaining Contractual Term 21 years 9 months 18 days    
Released, Weighted average remaining contractual life 33 years 8 months 12 days    
Aggregate intrinsic value, outstanding value $ 12,420    
Released Aggregate Intrinsic Value 6,792    
Intrinsic value of RSU's converted 1,520 $ 2,933 $ 5,670
Fair value of RSU's vested $ 1,928 $ 1,908 $ 2,055
Nonvested RSUs      
Summary of Service-Based Restricted Stock Units      
Nonvested at beginning of the year, RSUs, shares 218,849    
Granted, RSUs 195,266    
Vested, RSUs (126,944)    
Forfeited, RSUs (35,926)    
Nonvested at end of period, RSUs, shares 251,245 218,849  
Weighted Average Grant Date Fair Value      
Nonvested at beginning of year, Weighted-average Grant-Date Fair Value $ 16.29    
Granted, Weighted-average Grant-Date Fair Value 15.07    
Converted, Weighted-average Grant-Date Fair Value 15.19    
Forfeited, Weighted-average Grant-Date Fair Value 16.75    
Nonvested at end of period, Weighted-average Grant-Date Fair Value $ 15.81 $ 16.29