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Stock-based Compensation (Details) - USD ($)
1 Months Ended 12 Months Ended 132 Months Ended
May 31, 2017
Jan. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
May 20, 2014
Allocated Share-based Compensation Expense, Total     $ 7,900,000 $ 6,500,000 $ 5,900,000    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense     $ 1,800,000 $ 1,400,000 $ 1,900,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross           0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance     0     0  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options     $ 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     497,860     497,860  
Omnibus Plan 2014 [Member] | Minimum [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Award 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]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   3 years          
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%          
The 2019 Long-term Incentive Compensation Program [Member] | Minimum [Member]              
PRSU Awards, Percentage of Target Award, Below Threshold-level Performance   0.00%          
The 2019 Long-term Incentive Compensation Program [Member] | Maximum [Member]              
PRSU Awards, Percentage of Target Award, Below Threshold-level Performance     150.00%     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]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     263,574 280,590 276,900    
Restricted Stock Units (RSUs) [Member] | Omnibus Plan 2014 [Member]              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total     $ 7,100,000     $ 7,100,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     2 years 292 days        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 7,400,000 $ 7,100,000 $ 7,000,000.0    
Performance-based Restricted Stock Units [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     67,352        
Phantom Share Units (PSUs) [Member] | Phantom Stock Plan [Member]              
Allocated Share-based Compensation Expense, Total     $ 100,000 (500,000) (100,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 31,000 $ 12,000 $ 247,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period     1 year