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Stock-based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jan. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Stock-based compensation (benefit) expense   $ 900,000 $ 1,400,000   $ 3,400,000 $ 5,400,000
Income tax benefits related to the stock-based compensation plans   $ 200,000   $ 300,000 $ 800,000 $ 1,300,000
Stock options outstanding   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   2,500 0   172,728 263,574
Restricted Stock Units (RSUs) [Member] | Omnibus Plan 2014 [Member]            
Total unrecognized compensation cost   $ 7,400,000     $ 7,400,000  
Weighted-average period of recognition of compensation cost         2 years 7 months 6 days  
Total fair value of awards vested   $ 100,000 $ 200,000   $ 5,100,000 $ 6,200,000
Performance-based Restricted Stock Units [Member]            
Awards granted   0 0   72,143 57,870
Phantom Share Units (PSUs) [Member] | Phantom Stock Plan [Member]            
Stock-based compensation (benefit) expense   $ (200,000)     $ (1,100,000) $ 100,000
Total fair value of awards vested   $ 7,000 $ 1,000   $ 8,000 $ 22,000