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Employee Benefit Plans (Schedule of Benefits Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Pension Benefit Plan [Member]    
Periodic costs for employee retirement benefit plans    
Service Cost $ 577 $ 639
Interest Cost 761 724
Expected Return on Assets (1,004) (980)
Amortization of Unrecognized Losses $ 357 $ 411
Amortization of Unrecognized Prior Service Cost (Credit)
Net Periodic Benefit Cost $ 691 $ 794
Other Benefits Plan [Member]    
Periodic costs for employee retirement benefit plans    
Service Cost 275 343
Interest Cost 488 480
Expected Return on Assets (558) (527)
Amortization of Unrecognized Losses 443 565
Amortization of Unrecognized Prior Service Cost (Credit) (432) (432)
Net Periodic Benefit Cost $ 216 $ 429