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Employee Benefit Plans (Schedule of Benefits Plans) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Pension Benefit Plan [Member]        
Periodic costs for employee retirement benefit plans        
Service Cost $ 639 $ 473 $ 1,918 $ 1,420
Interest Cost 724 670 2,171 2,011
Expected Return on Assets (980) (883) (2,939) (2,650)
Amortization of Unrecognized Losses $ 411 104 $ 1,234 312
Amortization of Unrecognized Prior Service Cost (Credit) 1 2
Net Periodic Benefit Cost $ 794 365 $ 2,384 1,095
Other Benefits Plan [Member]        
Periodic costs for employee retirement benefit plans        
Service Cost 343 258 1,029 774
Interest Cost 480 448 1,441 1,344
Expected Return on Assets (527) (484) (1,580) (1,453)
Amortization of Unrecognized Losses 565 353 1,696 1,060
Amortization of Unrecognized Prior Service Cost (Credit) (432) (432) (1,296) (1,296)
Net Periodic Benefit Cost $ 429 $ 143 $ 1,290 $ 429