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Stock-Based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jul. 14, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment arrangement, expense   $ 7,919 $ 8,608 $ 26,864 $ 18,536
Performance share units expense          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment arrangement, expense   4,293 5,523 17,728 11,669
Performance share units expense | Equity Incentive Plan 2011 | Granted in 2018          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment arrangement, expense     1,300 1,300 6,000
Performance share units expense | Equity Incentive Plan 2011 | Granted in 2019          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment arrangement, expense   1,800 $ 4,200 5,500 $ 4,200
Performance share units expense | Equity Incentive Plan 2011 | Granted in 2020          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment arrangement, expense   2,500   10,900  
Performance share units expense | Equity Incentive Plan 2011 | Granted in 2021          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based payment arrangement, expense   $ 0   $ 0  
Target goal, PSUs (in shares) 397,500        
Fair Value per Share (in dollars per share) $ 44.35