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Employee Benefit Plans (Schedule of Change in Projected Benefit Obligation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Pension Benefit Plan [Member]      
Change in Projected Benefit Obligation:      
Beginning Balance $ 78,601 $ 72,542  
Service Cost 2,399 2,308 $ 2,558
Interest Cost 3,143 3,046 2,894
Actuarial Loss 6,203 2,810  
Benefits Paid (2,333) (2,105)  
Ending Balance 88,013 78,601 72,542
Other Benefits Plan [Member]      
Change in Projected Benefit Obligation:      
Beginning Balance 48,888 46,249  
Service Cost 1,089 1,099 1,373
Interest Cost 1,964 1,952 1,921
Actuarial Loss 3,052 141  
Benefits Paid (648) (553)  
Ending Balance $ 54,345 $ 48,888 $ 46,249