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Employee Benefit Plans (Schedule of Benefits Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Pension Benefit Plan [Member]    
Periodic costs for employee retirement benefit plans    
Service Cost $ 600 $ 577
Interest Cost 786 761
Expected Return on Assets (1,122) (1,004)
Amortization of Unrecognized Losses 391 357
Amortization of Unrecognized Prior Service Credit
Net Periodic Benefit Cost 655 691
Other Benefits Plan [Member]    
Periodic costs for employee retirement benefit plans    
Service Cost 272 275
Interest Cost 491 488
Expected Return on Assets (601) (558)
Amortization of Unrecognized Losses 445 443
Amortization of Unrecognized Prior Service Credit (432) (432)
Net Periodic Benefit Cost $ 175 $ 216