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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, 2018
USD ($)
plan
$ / shares
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
plan
$ / shares
shares
Sep. 30, 2017
USD ($)
Dec. 31, 2017
$ / shares
shares
Share-based Compensation          
Number of Equity-Based Compensation Plans | plan 5   5    
Restricted stock units     $ 4,104 $ 2,514  
Allocated Share-based Compensation Expense, Net of Tax $ 1,485 $ 516 3,177 1,569  
Service-Based RSUs          
Share-based Compensation          
Restricted stock units 523 415 1,541 1,430  
Performance and market-based RSU's          
Share-based Compensation          
Restricted stock units $ 1,258 360 $ 2,411 1,040  
Cash Settled Awards          
Share-based Compensation          
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares 17,248   17,248   14,082
Restricted stock units $ 137 52 $ 152 44  
RSUs          
Share-based Compensation          
Restricted stock units 1,918 827 4,104 2,514  
Income tax benefit $ 433 $ 311 $ 927 $ 945  
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     1,938    
Releasable - weighted average fair value | $ / shares $ 12.82   $ 12.82    
Granted - shares | shares     74,222    
Forfeited - weighted average fair value | $ / shares     $ 20.86    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Released Number | shares     130,634    
Granted - weighted average fair value | $ / shares     $ 26.31    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value | $ / shares $ 17.25   17.25   $ 14.60
Converted - weighted average fair value | $ / shares     $ 14.24    
Releasable - shares | shares 194,674   194,674    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares 340,997   340,997   399,347