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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, 2018
Dec. 31, 2017
Retirement Benefits [Abstract]    
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation $ 174,400 $ 169,705
Defined Benefit Plan, Plan Assets, Amount $ 102,561 $ 103,236