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Employee Benefit Plans (Schedule of Change in Projected Benefit Obligation) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Pension Benefit Plan [Member]      
Change in Projected Benefit Obligation:      
Beginning Balance $ 88,013 $ 78,601  
Service Cost 2,426 2,399 $ 2,308
Interest Cost 3,061 3,143 3,046
Actuarial Loss (7,018) 6,203  
Benefits Paid (2,555) (2,333)  
Ending Balance 83,927 88,013 78,601
Other Benefits Plan [Member]      
Change in Projected Benefit Obligation:      
Beginning Balance 54,345 48,888  
Service Cost 1,135 1,089 1,099
Interest Cost 1,898 1,964 1,952
Actuarial Loss (8,160) 3,052  
Benefits Paid (744) (648)  
Ending Balance $ 48,474 $ 54,345 $ 48,888