Employee Benefit Plans (Schedule of Expected Future Benefit Payments) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
Defined Benefit Plan, Expected Future Benefit Payments in Year One	$ 8,944
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	8,709
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	11,467
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	10,250
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	10,474
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	63,526
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	1,132
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	1,387
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	1,650
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	1,977
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	2,327
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 16,374