Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Cost (Benefit)			$ (36,714)	$ (45,081)
Early retirement programs and special separation benefit expense			0	3,734
Total Cost (Benefit)	$ (12,389)	$ (16,255)	(36,714)	(41,077)
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5,040	6,090	15,422	20,593
Interest cost	12,845	13,516	38,763	39,077
Expected return on assets	(30,348)	(33,673)	(91,122)	(96,771)
Amortization of prior service cost (credit)	74	79	223	241
Recognized actuarial loss (gain)	0	(6,057)	0	(6,057)
Net Periodic Cost (Benefit)	(12,389)	(20,045)	(36,714)	(42,917)
Curtailment gain	0	(3,267)	0	(3,267)
Early retirement programs and special separation benefit expense	0	3,734	0	3,734
Total Cost (Benefit)	(12,389)	(19,578)	(36,714)	(42,450)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	246	464	738	1,482
Interest cost	1,096	1,140	3,288	3,410
Amortization of prior service cost (credit)	114	115	342	343
Recognized actuarial loss (gain)	665	630	1,995	2,385
Net Periodic Cost (Benefit)	2,121	2,349	6,363	7,620
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	346	333	1,039	999
Interest cost	308	325	923	974
Amortization of prior service cost (credit)	(83)	(126)	(251)	(377)
Recognized actuarial loss (gain)	(376)	(249)	(1,127)	(747)
Net Periodic Cost (Benefit)	$ 195	283	$ 584	849
Discontinued Operations [Member] | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Cost (Benefit)		$ 100		1,900
Discontinued Operations [Member] | Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Cost (Benefit)				$ 200