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Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2016
Jun. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Term     10 years    
Excess Tax Benefit from Share-based Compensation     $ 1,687 $ 2,463 $ 2,229
Allocated Share-based Compensation Expense     12,175 12,285 11,493
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     2,613 4,579 4,284
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized     $ 15,084    
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition     2 years 2 months 12 days    
Proceeds from Stock Options Exercised     $ 673 1,964 4,184
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value     $ 1,589 $ 2,887 $ 4,464
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 12.80 $ 10.31 $ 7.01
State [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess Tax Benefit from Share-based Compensation         $ 198
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     6 months    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     5 years    
Performance Share Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period     3 years    
Performance period     3 years    
New Accounting Pronouncement, Early Adoption, Effect [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Excess Tax Benefit from Share-based Compensation $ 413 $ 524