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Employee Benefit Plans (Schedule of Reconciliation of Prepaid Pension Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Pension Plan [Member]      
Prepaid pension cost (liability) as of beginning of fiscal year $ 5,007 $ 3,524  
Net periodic pension cost for fiscal year 958 1,483 $ 1,318
Actual employer contributions
Benefits paid (2,114) (2,051) (1,714)
Prepaid pension cost (liability) as of end of fiscal year 5,965 5,007 3,524
SERP [Member]      
Prepaid pension cost (liability) as of beginning of fiscal year (6,802) (6,816)  
Net periodic pension cost for fiscal year (309) (328) (263)
Benefits paid (357) (342) (295)
Prepaid pension cost (liability) as of end of fiscal year $ (6,754) $ (6,802) $ (6,816)