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Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
plan
$ / shares
shares
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
plan
$ / shares
shares
Sep. 30, 2018
USD ($)
Dec. 31, 2018
$ / shares
shares
Share-based Compensation          
Number of Equity-Based Compensation Plans | plan 5   5    
Restricted stock units     $ 3,950 $ 4,104  
Allocated Share-based Compensation Expense, Net of Tax $ 895 $ 1,485 3,057 3,177  
Service-Based RSUs          
Share-based Compensation          
Restricted stock units 618 523 1,712 1,541  
Performance-Based RSUs          
Share-based Compensation          
Restricted stock units $ 486 1,258 $ 2,072 2,411  
Cash Settled Awards          
Share-based Compensation          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares 17,271   17,271   17,248
Restricted stock units $ 53   $ 166 152  
Restricted Stock Expense (Benefit)   137      
RSUs          
Share-based Compensation          
Restricted stock units 1,157 1,918 3,950 4,104  
Income tax benefit $ 262 $ 433 $ 893 $ 927  
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     15,899    
Releasable - weighted average fair value | $ / shares $ 13.79   $ 13.79    
Granted - shares | shares     74,591    
Forfeited - weighted average fair value | $ / shares     $ 27.00    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Released Number | shares     67,526    
Granted - weighted average fair value | $ / shares     $ 28.78    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 19.43   19.43   $ 17.91
Converted - weighted average fair value | $ / shares     $ 19.97    
Releasable - shares | shares 206,474   206,474    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares 346,756   346,756   355,590