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Employee Benefit Plans (Schedule of Employee Benefit Plans Recognized in Balance Sheet) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]    
Noncurrent Liability $ 36,515 $ 45,135
Pension Benefit Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current Liability 327 328
Noncurrent Liability 19,284 23,092
Net Liability Recognized $ 19,611 $ 23,420
Other Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Current Liability
Noncurrent Liability $ 17,231 $ 22,043
Net Liability Recognized $ 17,231 $ 22,043