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Stock-based Compensation (Details) - USD ($)
1 Months Ended 12 Months Ended 144 Months Ended
May 31, 2017
Jan. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2020
May 20, 2014
Stock-based compensation (benefit) expense     $ 6,000,000.0 $ 7,900,000 $ 6,500,000    
Income tax benefits related to the stock-based compensation plans     $ 1,400,000 $ 1,800,000 $ 1,400,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           0  
Stock options outstanding     0 0   0  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 0 $ 0   $ 0  
Omnibus Plan 2014 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             1,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 672,000            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     324,738     324,738  
Omnibus Plan 2014 [Member] | Minimum [Member]              
Awards vesting period     3 years        
Omnibus Plan 2014 [Member] | Maximum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period     10 years        
The 2019 Long-term Incentive Compensation Program [Member]              
Awards vesting period   3 years          
PRSU Awards, Percentage of Target Award, Below Threshold-level Performance   0.00%          
PRSU Awards, Percentage of Target Award, Threshold-level Performance   50.00%          
PRSU Awards, Percentage of Target Award, Target-Level Performance   100.00%          
PRSU Awards, Percentage of Target Award, Maximum-Level Performance   150.00%          
Phantom Stock Plan [Member] | Officer [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights in the First Five Years of Employment, Percentage     20.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights After Five Years of Employment, Percentage     100.00%        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights Upon A Change in Control, Percentage     100.00%        
Restricted Stock Units (RSUs) [Member]              
Awards granted     173,528 263,574 280,590    
Restricted Stock Units (RSUs) [Member] | Omnibus Plan 2014 [Member]              
Total unrecognized compensation cost     $ 5,400,000     $ 5,400,000  
Weighted-average period of recognition of compensation cost     2 years 292 days        
Total fair value of awards vested     $ 5,700,000 $ 7,400,000 $ 7,100,000    
Performance-based Restricted Stock Units [Member]              
Awards granted     72,143 67,352      
Phantom Share Units (PSUs) [Member] | Phantom Stock Plan [Member]              
Stock-based compensation (benefit) expense     $ (400,000) $ 100,000 (500,000)    
Total fair value of awards vested     $ 10,000 $ 31,000 $ 12,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period     1 year