Employee Benefit Plans (Schedule of Expected Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
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