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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding      
Outstanding at end of year, units 271,305    
Weighted Average Grant Date Fair Value      
End of year, Weighted-average Grant-Date Fair Value $ 18.77    
Fair value of RSU's vested $ 5,471 $ 4,959 $ 2,803
Directors' Plan      
Summary of Service-Based Restricted Stock Units      
Nonvested at end of period, RSUs, shares 9,620    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding      
Outstanding at beginning of year, units 554,478    
Granted, units 57,740    
Released, units (201,918)    
Forfeited, units (10,953)    
Outstanding at end of year, units 399,347 554,478  
Weighted Average Grant Date Fair Value      
Beginning of year, Weighted-average Grant-Date Fair Value $ 13.37    
Granted, Weighted-average Grant-Date Fair Value 24.32 $ 15.07 $ 17.31
Converted, Weighted-average Grant-Date Fair Value 13.85    
Forfeited, Weighted-average Grant-Date Fair Value 17.11    
End of year, Weighted-average Grant-Date Fair Value 14.60 $ 13.37  
Convertible at end of period, Weighted-average Grant-Date Fair Value $ 12.48    
Released at end of period, RSUs 259,811    
Weighted Average Remaining Contractual Term 24 years 6 months 28 days    
Released, Weighted average remaining contractual life 33 years 10 months 18 days    
Aggregate intrinsic value, outstanding value $ 10,283    
Released Aggregate Intrinsic Value 6,690    
Intrinsic value of RSU's converted $ 4,485 $ 1,520 $ 2,933
Nonvested RSUs      
Summary of Service-Based Restricted Stock Units      
Nonvested at beginning of the year, RSUs, shares 251,245    
Granted, RSUs 57,740    
Vested, RSUs (158,496)    
Forfeited, RSUs (10,953)    
Nonvested at end of period, RSUs, shares 139,536 251,245  
Weighted Average Grant Date Fair Value      
Nonvested at beginning of year, Weighted-average Grant-Date Fair Value $ 15.81    
Granted, Weighted-average Grant-Date Fair Value 24.32    
Converted, Weighted-average Grant-Date Fair Value 16.40    
Forfeited, Weighted-average Grant-Date Fair Value 17.11    
Nonvested at end of period, Weighted-average Grant-Date Fair Value $ 18.56 $ 15.81