Pension and Other Post-Retirement Benefit Plans (Net Periodic Benefit Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	$ 0	$ 0	$ 98,700
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	0	0	0
Interest cost	35,872	34,584	39,517
Expected return on plan assets	(41,056)	(44,082)	(46,111)
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	0	0	11,660
Amortization of prior service cost	0	0	0
Amortization of net (gain) loss	13,472	7,170	(2)
Net periodic benefit cost (income)	8,288	(2,328)	5,064
Pension Plans [Member] | Continuing Operations [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements			(6,700)
Pension Plans [Member] | Discontinued Operations [Member]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements			(4,960)
Post-Retirement Healthcare Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Settlements, Benefit Obligation	(560)	0
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Service cost	123	177	239
Interest cost	170	192	286
Expected return on plan assets	0	0	0
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements	(1,997)	0	0
Amortization of prior service cost	(103)	(542)	(3,487)
Amortization of net (gain) loss	160	292	321
Net periodic benefit cost (income)	$ (1,647)	$ 119	$ (2,641)