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Employee Benefit Plans (Schedule of Periodic Costs For Employee Retirement Benefit Plans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Benefit Plan [Member]      
Periodic costs for employee retirement benefit plans      
Service Cost $ 2,558 $ 1,894 $ 2,300
Interest Cost 2,894 2,682 2,468
Expected Return on Plan Assets (3,919) (3,534) (2,894)
Amortization of Net Actuarial Loss $ 1,645 416 1,632
Amortization of Prior Service Cost/(Credit) 2 10
Net Periodic Benefit Cost $ 3,178 1,460 3,516
Other Benefits Plan [Member]      
Periodic costs for employee retirement benefit plans      
Service Cost 1,373 1,032 1,338
Interest Cost 1,921 1,792 1,594
Expected Return on Plan Assets (2,107) (1,937) (1,622)
Amortization of Net Actuarial Loss 2,261 1,413 2,066
Amortization of Prior Service Cost/(Credit) (1,728) (1,728) (1,728)
Net Periodic Benefit Cost $ 1,720 $ 572 $ 1,648