Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Cost (Benefit)			$ (24,325)	$ (22,872)
Total Cost (Benefit)	$ (12,266)	$ (12,415)	(24,325)	(24,822)
Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	5,040	7,251	10,382	14,503
Interest cost	12,845	12,781	25,918	25,561
Expected return on assets	(30,226)	(31,553)	(60,774)	(63,098)
Amortization of prior service cost (credit)	75	81	149	162
Net Periodic Cost (Benefit)	(12,266)	(11,440)	(24,325)	(22,872)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	246	509	492	1,018
Interest cost	1,096	1,135	2,192	2,270
Amortization of prior service cost (credit)	114	114	228	228
Recognized actuarial loss (gain)	665	877	1,330	1,755
Net Periodic Cost (Benefit)	2,121	2,635	4,242	5,271
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	347	333	693	666
Interest cost	307	324	615	649
Amortization of prior service cost (credit)	(84)	(125)	(168)	(251)
Recognized actuarial loss (gain)	(376)	(249)	(751)	(498)
Net Periodic Cost (Benefit)	$ 194	283	$ 389	566
Discontinued Operations [Member] | Defined Benefit Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Cost (Benefit)		1,000		2,000
Discontinued Operations [Member] | Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Net Periodic Cost (Benefit)		$ 100		$ 200