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Employee Benefit Plans (Schedule of Reconciliation of Prepaid Pension Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Pension Plan      
Prepaid Pension Cost [Roll Forward]      
Prepaid pension cost (liability) as of beginning of fiscal year $ 6,851 $ 7,082  
Net periodic pension cost for fiscal year (897) (231) $ 1,117
Actual employer contributions 0 0 0
Benefits paid 1,736 1,948 2,080
Prepaid pension cost (liability) as of end of fiscal year 5,954 6,851 7,082
SERP      
Prepaid Pension Cost [Roll Forward]      
Prepaid pension cost (liability) as of beginning of fiscal year (6,608) (6,695)  
Net periodic pension cost for fiscal year (56) (311) (311)
Benefits paid 398 398  
Prepaid pension cost (liability) as of end of fiscal year $ (6,266) $ (6,608) $ (6,695)