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Employee Benefit Plans (Plan Asset Allocation) (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plan, Plan Assets, Allocations [Abstract]    
Target allocation, rebalancing range 5.00%  
Actual allocation 100.00% 100.00%
U.S. equity securities    
Defined Benefit Plan, Plan Assets, Allocations [Abstract]    
Target allocation 35.00%  
Actual allocation 35.00% 38.00%
Investment grade fixed income securities    
Defined Benefit Plan, Plan Assets, Allocations [Abstract]    
Target allocation 65.00%  
Actual allocation 65.00% 53.00%
High yield fixed income securities    
Defined Benefit Plan, Plan Assets, Allocations [Abstract]    
Actual allocation 0.00% 9.00%