Supplemental Guarantor and Non-Guarantor Financial Information (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Supplemental guarantor and non-guarantor financial information
Net income (loss)	$ (100,724)	$ (1,061,956)	$ (184,660)	$ (989,404)
Other comprehensive income (loss), net of tax:
Change in pension and postretirement benefit plans, net of tax	4,659	3,898	13,976	11,693
Change in unrealized gain (loss) on hedges, net of tax	653	(545)	1,901	(3,815)
Change in foreign currency translation adjustment	14,847	3,132	(2,239)	2,342
Change in unrealized gain (loss)on investments net of tax	(940)	1,135	(897)	766
Total other comprehensive income, net of tax	19,219	7,620	12,741	10,986
Total comprehensive loss	(81,505)	(1,054,336)	(171,919)	(978,418)
Parent (Issuer)
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(100,724)	(1,061,956)	(184,660)	(989,404)
Other comprehensive income (loss), net of tax:
Change in pension and postretirement benefit plans, net of tax	4,659	3,898	13,976	11,693
Change in unrealized gain (loss) on hedges, net of tax	653	(545)	1,901	(3,815)
Change in foreign currency translation adjustment	14,847	3,132	(2,239)	2,342
Change in unrealized gain (loss)on investments net of tax	(940)	1,135	(897)	766
Total other comprehensive income, net of tax	19,219	7,620	12,741	10,986
Total comprehensive loss	(81,505)	(1,054,336)	(171,919)	(978,418)
Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	8,184	100,408	52,368	265,855
Other comprehensive income (loss), net of tax:
Change in pension and postretirement benefit plans, net of tax	13,338		13,338	(50,756)
Change in unrealized gain (loss) on hedges, net of tax	12	23	49	72
Total other comprehensive income, net of tax	13,350	23	13,387	(50,684)
Total comprehensive loss	21,534	100,431	65,755	215,171
Non-Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(45,811)	(1,127,149)	(97,815)	(1,168,915)
Other comprehensive income (loss), net of tax:
Change in unrealized gain (loss) on hedges, net of tax				(2,519)
Change in foreign currency translation adjustment	14,847	3,132	(2,239)	2,342
Change in unrealized gain (loss)on investments net of tax	(940)	1,135	(897)	766
Total other comprehensive income, net of tax	13,907	4,267	(3,136)	589
Total comprehensive loss	(31,904)	(1,122,882)	(100,951)	(1,168,326)
Eliminations
Supplemental guarantor and non-guarantor financial information
Net income (loss)	37,627	1,026,741	45,447	903,060
Other comprehensive income (loss), net of tax:
Change in pension and postretirement benefit plans, net of tax	(13,338)		(13,338)	50,756
Change in unrealized gain (loss) on hedges, net of tax	(12)	(23)	(49)	2,447
Change in foreign currency translation adjustment	(14,847)	(3,132)	2,239	(2,342)
Change in unrealized gain (loss)on investments net of tax	940	(1,135)	897	(766)
Total other comprehensive income, net of tax	(27,257)	(4,290)	(10,251)	50,095
Total comprehensive loss	$ 10,370	$ 1,022,451	$ 35,196	$ 953,155