Accumulated Other Comprehensive Loss (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Schedule of Accumulated Comprehensive Income [Line Items]
Balance Beginning	$ (574,556)		$ (681,213)
Other comprehensive income (loss), before reclassifications	(5,470)		(43,504)
Amounts reclassified from accumulated other comprehensive income	6,693	[1],[2]	12,743	[1],[2]
Net current period other comprehensive income (loss)	1,223		(30,761)
Balance Ending	(573,333)		(711,974)
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	41		72
Amounts reclassified from accumulated other comprehensive income	332	[1],[2]	466	[1],[2]
Net current period other comprehensive income (loss)	373		538
Balance Ending	(6,007)		(7,239)
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	1,840		(1,372)
Amounts reclassified from accumulated other comprehensive income	219	[1],[2]	1,646	[1],[2]
Net current period other comprehensive income (loss)	2,059		274
Balance Ending	290		4,787
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		0
Amounts reclassified from accumulated other comprehensive income	6,142	[1],[2]	10,631	[1],[2]
Net current period other comprehensive income (loss)	6,142		10,631
Balance Ending	(595,279)		(748,568)
Foreign currency items
Schedule of Accumulated Comprehensive Income [Line Items]
Balance Beginning	35,014		81,250
Other comprehensive income (loss), before reclassifications	(7,351)		(42,204)
Amounts reclassified from accumulated other comprehensive income	0	[1],[2]	0	[1],[2]
Net current period other comprehensive income (loss)	(7,351)		(42,204)
Balance Ending	$ 27,663		$ 39,046

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

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