Pension and Postretirement Plans (Consolidated Balance Sheet) (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	$ 1,245,505	$ 604,823
Current liability	0	0
Noncurrent liability	0	0
Recognized asset (liability)	1,245,505	604,823
Supplemental Executive Retirement Plan (SERP) [Member]
Defined Benefit Plan Disclosure [Line Items]
Noncurrent asset	0	0
Current liability	(4,251)	(4,368)
Noncurrent liability	(86,918)	(99,694)
Recognized asset (liability)	(91,169)	(104,062)
Other Postretirement Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Current liability	(3,795)	(3,919)
Noncurrent liability	(36,219)	(59,949)
Recognized asset (liability)	$ (40,014)	$ (63,868)