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Employee Benefit Plans (Schedule of Expected Future Benefit Payments) (Details) $ in Thousands | Dec. 31, 2018 USD ($)
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Pension Plans, Defined Benefit [Member] |
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract] |
Defined Benefit Plan, Expected Future Benefit Payments in Year One | $ 9,977
Defined Benefit Plan, Expected Future Benefit Payments in Year Two | 12,013
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 11,663
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 14,229
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 14,128
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter | 77,832
Other Postretirement Benefit Plans, Defined Benefit [Member] |
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract] |
Defined Benefit Plan, Expected Future Benefit Payments in Year One | 1,528
Defined Benefit Plan, Expected Future Benefit Payments in Year Two | 1,835
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 2,209
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 2,633
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 3,009
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter | $ 20,359

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