Pension and Postretirement Plans (Accumulated Other Comprehensive Income) (Details 7) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Net amount	$ (501,446)	$ (117,169)	$ (63,625)
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (gain) loss	(840,273)	(193,469)
Unrecognized prior service cost	1,362	15,931
Gross amount	(838,911)	(177,538)
Deferred tax liability (asset)	335,564	71,015
Net amount	(503,347)	(106,523)
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (gain) loss	19,266	33,725
Unrecognized prior service cost	136	191
Gross amount	19,402	33,916
Deferred tax liability (asset)	(7,761)	(13,566)
Net amount	11,641	20,350
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Unrecognized actuarial (gain) loss	(13,928)	(25,525)
Unrecognized prior service cost	(2,306)	(26,128)
Gross amount	(16,234)	(51,653)
Deferred tax liability (asset)	6,494	20,661
Net amount	$ (9,740)	$ (30,992)