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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding      
Outstanding at end of year, units 267,792    
Weighted Average Grant Date Fair Value      
End of year, Weighted-average Grant-Date Fair Value $ 21.44    
Fair value of RSU's vested $ 5,805 $ 5,471 $ 4,959
Directors' Plan      
Summary of Service-Based Restricted Stock Units      
Nonvested at end of period, RSUs, shares 5,522    
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding      
Outstanding at beginning of year, units 399,347    
Granted, units 99,422    
Released, units (137,500)    
Forfeited, units (5,679)    
Outstanding at end of year, units 355,590 399,347  
Weighted Average Grant Date Fair Value      
Beginning of year, Weighted-average Grant-Date Fair Value $ 14.60    
Granted, Weighted-average Grant-Date Fair Value 26.95 $ 24.32 $ 15.07
Converted, Weighted-average Grant-Date Fair Value 14.68    
Forfeited, Weighted-average Grant-Date Fair Value 22.07    
End of year, Weighted-average Grant-Date Fair Value 17.91 $ 14.60  
Convertible at end of period, Weighted-average Grant-Date Fair Value $ 13.76    
Released at end of period, RSUs 209,474    
Weighted Average Remaining Contractual Term 22 years 5 months 14 days    
Released, Weighted average remaining contractual life 33 years 7 months 17 days    
Aggregate intrinsic value, outstanding value $ 9,206    
Released Aggregate Intrinsic Value 5,423    
Intrinsic value of RSU's converted $ 4,015 $ 4,485 $ 1,520
Nonvested RSUs      
Summary of Service-Based Restricted Stock Units      
Nonvested at beginning of the year, RSUs, shares 139,536    
Granted, RSUs 99,422    
Vested, RSUs (87,163)    
Forfeited, RSUs (5,679)    
Nonvested at end of period, RSUs, shares 146,116 139,536  
Weighted Average Grant Date Fair Value      
Nonvested at beginning of year, Weighted-average Grant-Date Fair Value $ 18.56    
Granted, Weighted-average Grant-Date Fair Value 26.95    
Converted, Weighted-average Grant-Date Fair Value 19.05    
Forfeited, Weighted-average Grant-Date Fair Value 22.07    
Nonvested at end of period, Weighted-average Grant-Date Fair Value $ 23.84 $ 18.56