Supplemental Guarantor and Non-Guarantor Financial Information (Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Supplemental guarantor and non-guarantor financial information
Net income (loss)	$ (98,902)	$ (100,724)	$ (342,471)	$ (184,660)
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	2,977	4,659	9,994	13,976
Change in unrealized gain on hedges, net of tax	0	653	1,679	1,901
Change in foreign currency translation adjustment	(21,672)	14,847	(8,244)	(2,239)
Change in unrealized loss on investments, net of tax	0	(940)	0	(897)
Total other comprehensive income (loss)	(18,695)	19,219	3,429	12,741
Total comprehensive loss	(117,597)	(81,505)	(339,042)	(171,919)
Reportable legal entities | Parent (Issuer)
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(98,902)	(100,724)	(342,471)	(184,660)
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	2,977	4,659	9,994	13,976
Change in unrealized gain on hedges, net of tax		653	1,679	1,901
Change in foreign currency translation adjustment	(21,672)	14,847	(8,244)	(2,239)
Change in unrealized loss on investments, net of tax		(940)		(897)
Total other comprehensive income (loss)	(18,695)	19,219	3,429	12,741
Total comprehensive loss	(117,597)	(81,505)	(339,042)	(171,919)
Reportable legal entities | Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(23,864)	8,184	(29,336)	52,368
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	2,963	13,338	9,954	13,338
Change in unrealized gain on hedges, net of tax		12	3	49
Change in foreign currency translation adjustment	0	0	0	0
Change in unrealized loss on investments, net of tax		0		0
Total other comprehensive income (loss)	2,963	13,350	9,957	13,387
Total comprehensive loss	(20,901)	21,534	(19,379)	65,755
Reportable legal entities | Non-Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net income (loss)	(360)	(45,811)	(89,115)	(97,815)
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	0	0	0	0
Change in unrealized gain on hedges, net of tax		0	0	0
Change in foreign currency translation adjustment	(21,672)	14,847	(8,244)	(2,239)
Change in unrealized loss on investments, net of tax		(940)		(897)
Total other comprehensive income (loss)	(21,672)	13,907	(8,244)	(3,136)
Total comprehensive loss	(22,032)	(31,904)	(97,359)	(100,951)
Eliminations
Supplemental guarantor and non-guarantor financial information
Net income (loss)	24,224	37,627	118,451	45,447
Other comprehensive income (loss)
Change in pension and postretirement benefit plans, net of tax	(2,963)	(13,338)	(9,954)	(13,338)
Change in unrealized gain on hedges, net of tax		(12)	(3)	(49)
Change in foreign currency translation adjustment	21,672	(14,847)	8,244	2,239
Change in unrealized loss on investments, net of tax		940		897
Total other comprehensive income (loss)	18,709	(27,257)	(1,713)	(10,251)
Total comprehensive loss	$ 42,933	$ 10,370	$ 116,738	$ 35,196