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Share-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
May 24, 2016
May 22, 2007
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 15, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock authorized to be issued under plan (in shares) 6,400,000.0          
Unrecognized pre-tax compensation cost     $ 14,300      
Weighted average recognition period (in years)     2 years 3 months 15 days      
Total intrinsic value of options exercised during period     $ 5,400 $ 4,500 $ 4,900  
Cash received from options exercised during period     4,987 $ 2,259 $ 2,063  
2007 Long-Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock authorized to be issued under plan (in shares) 400,000.0 3,300,000.0        
Award vesting period   5 years        
Exercise price of shares granted may not be less than fair market value (percentage)   100.00%        
2007 Long-Term Incentive Plan | Restricted Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Unrecognized pre-tax compensation cost     $ 6,100      
Weighted average recognition period (in years)     1 year 10 months 2 days      
Annual vesting, percentage     20.00%      
2016 Long-Term Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock authorized to be issued under plan (in shares) 3,400,000.0         2,600,000.0
Exercise price of shares granted may not be less than fair market value (percentage) 100.00%