Accumulated Other Comprehensive Loss (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014		Jun. 30, 2013
Schedule of Accumulated Comprehensive Income [Line Items]
Balance Beginning			$ (574,556)		$ (681,213)
Other comprehensive income (loss), before reclassifications			1,482	[1]	(68,328)	[1]
Amounts reclassified from accumulated other comprehensive income			13,723	[1],[2]	26,018	[1],[2]
Net current period other comprehensive income (loss)	13,982	(12,520)	15,205		(42,310)
Balance Ending	(559,351)	(723,523)	(559,351)		(723,523)
Gains (losses) on cash flow hedges
Schedule of Accumulated Comprehensive Income [Line Items]
Balance Beginning			(6,380)		(7,777)
Other comprehensive income (loss), before reclassifications			27	[1]	73	[1]
Amounts reclassified from accumulated other comprehensive income			763	[1],[2]	827	[1],[2]
Net current period other comprehensive income (loss)			790		900
Balance Ending	(5,590)	(6,877)	(5,590)		(6,877)
Unrealized gains (losses) on available for sale securities
Schedule of Accumulated Comprehensive Income [Line Items]
Balance Beginning			(1,769)		4,513
Other comprehensive income (loss), before reclassifications			3,657	[1]	(6,084)	[1]
Amounts reclassified from accumulated other comprehensive income			538	[1],[2]	1,639	[1],[2]
Net current period other comprehensive income (loss)			4,195		(4,445)
Balance Ending	2,426	68	2,426		68
Defined benefit pension plans and nonpension postretirement benefit plans
Schedule of Accumulated Comprehensive Income [Line Items]
Balance Beginning			(601,421)		(759,199)
Other comprehensive income (loss), before reclassifications			0	[1]	0	[1]
Amounts reclassified from accumulated other comprehensive income			12,422	[1],[2]	20,993	[1],[2]
Net current period other comprehensive income (loss)			12,422		20,993
Balance Ending	(588,999)	(738,206)	(588,999)		(738,206)
Foreign currency items
Schedule of Accumulated Comprehensive Income [Line Items]
Balance Beginning			35,014		81,250
Other comprehensive income (loss), before reclassifications			(2,202)	[1]	(62,317)	[1]
Amounts reclassified from accumulated other comprehensive income			0	[1],[2]	2,559	[1],[2]
Net current period other comprehensive income (loss)			(2,202)		(59,758)
Balance Ending	$ 32,812	$ 21,492	$ 32,812		$ 21,492

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

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