Supplemental Guarantor and Non-Guarantor Financial Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplemental guarantor and non-guarantor financial information
Net income (loss)	$ (92,178)	$ (49,444)
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	3,519	4,659
Change in unrealized gain on hedges, net of tax	1,679	722
Change in foreign currency translation adjustment	2,164	(15,625)
Change in unrealized gain on investments		44
Total other comprehensive income (loss)	7,362	(10,200)
Total comprehensive loss	(84,816)	(59,644)
Reportable legal entities | Parent (Issuer)
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(92,178)	(49,444)
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	3,519	4,659
Change in unrealized gain on hedges, net of tax	1,679	722
Change in foreign currency translation adjustment	2,164	(15,625)
Change in unrealized gain on investments		44
Total other comprehensive income (loss)	7,362	(10,200)
Total comprehensive loss	(84,816)	(59,644)
Reportable legal entities | Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	14,351	11,062
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	3,804
Change in unrealized gain on hedges, net of tax	3	21
Total other comprehensive income (loss)	3,807	21
Total comprehensive loss	18,158	11,083
Reportable legal entities | Non-Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(35,995)	(23,588)
Other comprehensive income (loss)
Change in foreign currency translation adjustment	2,164	(15,625)
Change in unrealized gain on investments		44
Total other comprehensive income (loss)	2,164	(15,581)
Total comprehensive loss	(33,831)	(39,169)
Eliminations
Supplemental guarantor and non-guarantor financial information
Net income (loss)	21,644	12,526
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	(3,804)
Change in unrealized gain on hedges, net of tax	(3)	(21)
Change in foreign currency translation adjustment	(2,164)	15,625
Change in unrealized gain on investments		(44)
Total other comprehensive income (loss)	(5,971)	15,560
Total comprehensive loss	$ 15,673	$ 28,086