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Equity-Based Compensation - Summary of Equity-Based Compensation Expense (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
plan
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
plan
$ / shares
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
$ / shares
shares
Share-based Compensation          
Number of Equity-Based Compensation Plans | plan 5   5    
Restricted stock units     $ 2,186 $ 1,687  
Allocated Share-based Compensation Expense, Net of Tax $ 978 $ 504 1,692 1,053  
Service-Based RSUs          
Share-based Compensation          
Restricted stock units 563 465 1,018 1,015  
Performance and market-based RSU's          
Share-based Compensation          
Restricted stock units $ 643 297 $ 1,153    
Restricted stock expense (reversal)       (680)  
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 expense (reversal) $ (57) (46) $ (15) (8)  
RSUs          
Share-based Compensation          
Restricted stock units 1,263 808 2,186 1,687  
Income tax benefit $ 285 $ 304 $ 494 $ 634  
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     130,301    
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 $ 17.26   17.26   $ 14.60
Converted - weighted average fair value | $ / shares     $ 14.22    
Releasable - shares | shares 194,674   194,674    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares 341,330   341,330   399,347