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Stock-based Compensation (Details) - USD ($)
3 Months Ended 135 Months Ended
Jan. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Allocated Share-based Compensation Expense, Total   $ 2,500,000 $ 4,000,000.0  
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense   $ 600,000 $ 1,000,000.0  
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
Omnibus Plan 2014 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
The 2019 Long-term Incentive Compensation Program [Member]        
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%      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   170,228 263,574  
Restricted Stock Units (RSUs) [Member] | Omnibus Plan 2014 [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total   $ 8,400,000   $ 8,400,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   2 years 8 months 12 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 5,000,000.0 $ 6,100,000  
Performance-based Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   72,143 57,870  
Phantom Share Units (PSUs) [Member] | Phantom Stock Plan [Member]        
Allocated Share-based Compensation Expense, Total   $ (900,000) $ 100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 1,000 $ 22,000