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Stock-based Compensation (Details) - USD ($)
3 Months Ended 9 Months Ended 15 Months Ended
Jan. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Stock-based compensation (benefit) expense   $ 900,000 $ 1,200,000   $ 4,300,000 $ 6,500,000  
Income tax benefits related to the stock-based compensation plans   $ 200,000   $ 200,000 $ 1,000,000.0 $ 1,500,000  
Stock options outstanding   0     0   0
Omnibus Plan 2014 [Member]              
Awards 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]              
Awards granted         172,728 263,574 0
Restricted Stock Units (RSUs) [Member] | Omnibus Plan 2014 [Member]              
Total unrecognized compensation cost   $ 6,300,000     $ 6,300,000   $ 6,300,000
Weighted-average period of recognition of compensation cost         2 years 6 months    
Total fair value of awards vested   $ 200,000 $ 700,000   $ 5,200,000 $ 6,900,000  
Performance-based Restricted Stock Units [Member]              
Awards granted   0 8,260   72,143 66,130  
Phantom Share Units (PSUs) [Member] | Phantom Stock Plan [Member]              
Stock-based compensation (benefit) expense   $ 100,000 $ 200,000   $ 1,200,000 $ 100,000  
Total fair value of awards vested   $ 3,000 $ 1,000   $ 10,000 $ 23,000