Accumulated Other Comprehensive Loss (Changes) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				$ (846,156)	$ (574,556)
Other comprehensive income (loss) before reclassifications	[1]			(61,794)	1,482
Amounts reclassified from accumulated other comprehensive loss	[1],[2]			15,444	13,723
Net current period other comprehensive income (loss)		$ 16,141	$ 13,982	(46,350)	15,205
Balance at		(892,506)	(559,351)	(892,506)	(559,351)
(Gains) losses on cash flow hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				(4,689)	(6,380)
Other comprehensive income (loss) before reclassifications	[1]			(1,273)	27
Amounts reclassified from accumulated other comprehensive loss	[1],[2]			1,489	763
Net current period other comprehensive income (loss)				216	790
Balance at		(4,473)	(5,590)	(4,473)	(5,590)
(Gains) losses on available for sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				2,966	(1,769)
Other comprehensive income (loss) before reclassifications	[1]			(1,499)	3,657
Amounts reclassified from accumulated other comprehensive loss	[1],[2]			26	538
Net current period other comprehensive income (loss)				(1,473)	4,195
Balance at		1,493	2,426	1,493	2,426
Pension and postretirement benefit plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				(786,079)	(601,421)
Other comprehensive income (loss) before reclassifications	[1]			0	0
Amounts reclassified from accumulated other comprehensive loss	[1],[2]			13,929	12,422
Net current period other comprehensive income (loss)				13,929	12,422
Balance at		(772,150)	(588,999)	(772,150)	(588,999)
Foreign currency items
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at				(58,354)	35,014
Other comprehensive income (loss) before reclassifications	[1]			(59,022)	(2,202)
Amounts reclassified from accumulated other comprehensive loss	[1],[2]			0	0
Net current period other comprehensive income (loss)				(59,022)	(2,202)
Balance at		$ (117,376)	$ 32,812	$ (117,376)	$ 32,812

[1] Amounts are net of tax. Amounts in parentheses indicate debits to AOCL.

[2] See table above for additional details of these reclassifications.