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Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
plan
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
$ / shares
shares
Share-based Compensation      
Number of Equity-Based Compensation Plans | plan 5    
Restricted stock units $ 1,214 $ 923  
Allocated Share-based Compensation Expense, Net of Tax 940 714  
Service-Based RSUs      
Share-based Compensation      
Restricted stock units 606 455  
Performance-Based RSUs      
Share-based Compensation      
Restricted stock units $ 548 510  
Cash Settled Awards      
Share-based Compensation      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares 17,308   17,248
Restricted stock units $ 60    
Restricted Stock Expense (Benefit)   (42)  
RSUs      
Share-based Compensation      
Restricted stock units 1,214 923  
Income tax benefit $ 274 $ 209  
Officers, key employees, and non-employee directors | Service-Based RSUs      
Share-based Compensation      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Forfeitures | shares 1,061    
Releasable - weighted average fair value | $ / shares $ 13.60    
Granted - shares | shares 72,591    
Forfeited - weighted average fair value | $ / shares $ 22.13    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Released Number | shares 65,623    
Granted - weighted average fair value | $ / shares $ 28.79    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares 19.71   $ 17.91
Converted - weighted average fair value | $ / shares $ 19.92    
Releasable - shares | shares 204,640    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares 361,497   355,590