Supplemental Guarantor and Non-Guarantor Financial Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Supplemental guarantor and non-guarantor financial information
Net income (loss)	$ (151,391)	$ (34,492)	$ (243,569)	$ (83,936)
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	3,498	4,658	7,017	9,317
Change in unrealized gain on hedges, net of tax		526	1,679	1,248
Change in foreign currency translation adjustment	11,264	(1,461)	13,428	(17,086)
Change in unrealized gain on investments		(1)		43
Total other comprehensive income (loss)	14,762	3,722	22,124	(6,478)
Total comprehensive loss	(136,629)	(30,770)	(221,445)	(90,414)
Reportable legal entities | Parent (Issuer)
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(151,391)	(34,492)	(243,569)	(83,936)
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	3,498	4,658	7,017	9,317
Change in unrealized gain on hedges, net of tax		526	1,679	1,248
Change in foreign currency translation adjustment	11,264	(1,461)	13,428	(17,086)
Change in unrealized gain on investments		(1)		43
Total other comprehensive income (loss)	14,762	3,722	22,124	(6,478)
Total comprehensive loss	(136,629)	(30,770)	(221,445)	(90,414)
Reportable legal entities | Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(19,823)	33,122	(5,472)	44,184
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	3,187		6,991
Change in unrealized gain on hedges, net of tax		16	3	37
Total other comprehensive income (loss)	3,187	16	6,994	37
Total comprehensive loss	(16,636)	33,138	1,522	44,221
Reportable legal entities | Non-Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(52,760)	(28,416)	(88,755)	(52,004)
Other comprehensive income (loss)
Change in foreign currency translation adjustment	11,264	(1,461)	13,428	(17,086)
Change in unrealized gain on investments		(1)		43
Total other comprehensive income (loss)	11,264	(1,462)	13,428	(17,043)
Total comprehensive loss	(41,496)	(29,878)	(75,327)	(69,047)
Eliminations
Supplemental guarantor and non-guarantor financial information
Net income (loss)	72,583	(4,706)	94,227	7,820
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	(3,187)		(6,991)
Change in unrealized gain on hedges, net of tax		(16)	(3)	(37)
Change in foreign currency translation adjustment	(11,264)	1,461	(13,428)	17,086
Change in unrealized gain on investments		1		(43)
Total other comprehensive income (loss)	(14,451)	1,446	(20,422)	17,006
Total comprehensive loss	$ 58,132	$ (3,260)	$ 73,805	$ 24,826