Supplemental Guarantor and Non-Guarantor Financial Information (Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Supplemental guarantor and non-guarantor financial information
Net loss	$ (80,196)	$ (92,178)
Other comprehensive income (loss):
Change in pension and other postretirement benefit plans, net of tax	3,699	3,519
Change in unrealized gain on hedges, net of tax	0	1,679
Change in foreign currency translation adjustment	(18,325)	2,164
Total other comprehensive income (loss)	(14,626)	7,362
Total comprehensive loss	(94,822)	(84,816)
Reportable legal entities | Parent (Issuer)
Supplemental guarantor and non-guarantor financial information
Net loss	(80,196)	(92,178)
Other comprehensive income (loss):
Change in pension and other postretirement benefit plans, net of tax	3,699	3,519
Change in unrealized gain on hedges, net of tax		1,679
Change in foreign currency translation adjustment	(18,325)	2,164
Total other comprehensive income (loss)	(14,626)	7,362
Total comprehensive loss	(94,822)	(84,816)
Reportable legal entities | Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net loss	(45,145)	11,482
Other comprehensive income (loss):
Change in pension and other postretirement benefit plans, net of tax	3,550	3,804
Change in unrealized gain on hedges, net of tax		3
Change in foreign currency translation adjustment	0	0
Total other comprehensive income (loss)	3,550	3,807
Total comprehensive loss	(41,595)	15,289
Reportable legal entities | Non-Guarantor Subsidiaries
Supplemental guarantor and non-guarantor financial information
Net loss	(11,883)	(33,126)
Other comprehensive income (loss):
Change in pension and other postretirement benefit plans, net of tax	0	0
Change in unrealized gain on hedges, net of tax		0
Change in foreign currency translation adjustment	(18,325)	2,164
Total other comprehensive income (loss)	(18,325)	2,164
Total comprehensive loss	(30,208)	(30,962)
Eliminations
Supplemental guarantor and non-guarantor financial information
Net loss	57,028	21,644
Other comprehensive income (loss):
Change in pension and other postretirement benefit plans, net of tax	(3,550)	(3,804)
Change in unrealized gain on hedges, net of tax		(3)
Change in foreign currency translation adjustment	18,325	(2,164)
Total other comprehensive income (loss)	14,775	(5,971)
Total comprehensive loss	$ 71,803	$ 15,673