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Employee Benefit Plans (Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Gain on termination of postretirement benefit plan   $ (6,637)
Pension Benefits [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Net actuarial loss (gain) $ 1,544 1,025
Amortization of net actuarial loss (gain) (561) (549)
Total recognized in accumulated other comprehensive loss (gain) $ 983 476
Postretirement Benefit Plan [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Liability gain due to termination   (4,369)
Gain on termination of postretirement benefit plan   6,637
Amortization of net actuarial loss (gain)   389
Amortization of prior service cost   (14)
Total recognized in accumulated other comprehensive loss (gain)   $ 2,643