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Employee Benefit Plans (Schedule of Projected Benefit Obligations in Excess of Fair Value of Plan Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Retirement Benefits [Abstract] |  |
Defined Benefit Plan, Benefit Obligation | $ 178,604 | $ 172,143
Defined Benefit Plan, Plan Assets, Amount | $ 102,561 | $ 103,236

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