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Employee Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Benefit Plans [Abstract]      
Defined contribution plan, employer matching contribution, percent 4.00%    
Defined contribution plan, vesting percentage 100.00%    
Employer contributions to 401(k) plan $ 1.5 $ 1.6 $ 2.0
Defined benefit pension plan, assets 5.6    
Defined benefit pension plan, liabilities 6.8    
Net liabilities included on the balance sheet $ (1.2) $ (1.2)