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Employee Benefit Plans (Schedule of Reconciliation of Prepaid Pension Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Plan [Member]      
Prepaid pension cost (liability) as of beginning of fiscal year $ 7,082 $ 5,965  
Net periodic pension cost for fiscal year (231) 1,117 $ 958
Actual employer contributions
Benefits paid (1,948) (2,080) (2,114)
Prepaid pension cost (liability) as of end of fiscal year 6,851 7,082 5,965
SERP [Member]      
Prepaid pension cost (liability) as of beginning of fiscal year (6,695) (6,754)  
Net periodic pension cost for fiscal year (311) (311) (309)
Benefits paid (398) (370)  
Prepaid pension cost (liability) as of end of fiscal year $ (6,608) $ (6,695) $ (6,754)