Supplemental Guarantor and Non-Guarantor Financial Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Supplemental guarantor and non-guarantor financial information
Net income (loss)	$ (49,444)	$ 40,616
Other comprehensive income (loss), net of tax:
Change in pension and postretirement benefit plans, net of tax	4,659	3,898
Change in unrealized loss on hedges, net of tax	722	(1,283)
Change in foreign currency translation adjustment	(15,625)	2,419
Change in unrealized gain (loss) on investments	44	(369)
Total comprehensive income (loss)	(59,644)	45,281
Total other comprehensive income (loss), net of tax	(10,200)	4,665
Parent (Issuer)
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(49,444)	40,616
Other comprehensive income (loss), net of tax:
Change in pension and postretirement benefit plans, net of tax	4,659	3,898
Change in unrealized loss on hedges, net of tax	722	(1,283)
Change in foreign currency translation adjustment	(15,625)	2,419
Change in unrealized gain (loss) on investments	44	(369)
Total comprehensive income (loss)	(59,644)	45,281
Total other comprehensive income (loss), net of tax	(10,200)	4,665
Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	11,062	79,133
Other comprehensive income (loss), net of tax:
Change in pension and postretirement benefit plans, net of tax		(50,756)
Change in unrealized loss on hedges, net of tax	21	20
Total comprehensive income (loss)	11,083	28,397
Total other comprehensive income (loss), net of tax	21	(50,736)
Non-Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(23,588)	(14,184)
Other comprehensive income (loss), net of tax:
Change in unrealized loss on hedges, net of tax		(690)
Change in foreign currency translation adjustment	(15,625)	2,419
Change in unrealized gain (loss) on investments	44	(369)
Total comprehensive income (loss)	(39,169)	(12,824)
Total other comprehensive income (loss), net of tax	(15,581)	1,360
Eliminations
Supplemental guarantor and non-guarantor financial information
Net income (loss)	12,526	(64,949)
Other comprehensive income (loss), net of tax:
Change in pension and postretirement benefit plans, net of tax		50,756
Change in unrealized loss on hedges, net of tax	21	670
Change in foreign currency translation adjustment	15,625	(2,419)
Change in unrealized gain (loss) on investments	(44)	369
Total comprehensive income (loss)	28,086	(15,573)
Total other comprehensive income (loss), net of tax	$ 15,560	$ 49,376