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Employee Benefit Plans (Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]    
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets, Aggregate Accumulated Benefit Obligation $ 140,442 $ 135,850
Defined Benefit Plan, Fair Value of Plan Assets $ 68,435 $ 66,757