Income Taxes (Narrative) (Details) (USD $)	12 Months Ended					12 Months Ended		12 Months Ended				12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Convertible Debt [Member]	Dec. 31, 2011 Investments in Foreign Subsidiaries and Foreign Corporate Joint Ventures that are Essentially Permanent in Duration [Member]	Dec. 31, 2011 Research [Member]	Dec. 31, 2011 Alternative Minimum Tax [Member]	Dec. 31, 2011 Charitable Contribution [Member]	Dec. 31, 2011 U.S. [Member]	Dec. 31, 2010 U.S. [Member]	Dec. 31, 2011 State and Local Jurisdiction [Member]	Dec. 31, 2011 Non-U.S. [Member]	Dec. 31, 2010 Non-U.S. [Member]	Dec. 31, 2011 German Tax Authority [Member]	Dec. 31, 2011 Canadian Revenue Agency [Member]	Dec. 31, 2008 Canadian Revenue Agency [Member]	Dec. 31, 2009 Integration of Note Hedge and Convertible Bonds [Member]	Dec. 31, 2011 Tax Attributes With Limited Lives [Member]	Dec. 31, 2011 Operating Loss Carryforwards [Member]
Income Tax Disclosure [Line Items]
Tax effect of adjustment due to a prior year error	$ (3,553,000)
Net increase in valuation allowance																			21,200,000
Issuance of convertible bonds	180,000,000
Interest rate				2.25%
Cost of hedge	47,700,000
Income tax expense/(benefit)																	19,200,000
Net operating loss carryforwards	786,100,000								1,000,000		52,800,000
Tax credit carryforward						7,000,000	1,300,000	1,400,000				28,600,000
Expiration of tax credit carryforward						2018		2012				2012
Net deferred tax asset									81,862,000	79,697,000		6,398,000	25,349,000					38,900,000
Tax credits expected to expire unutilized												700,000
Undistributed earnings of foreign subsidiaries	7,300,000				281,000,000
Income tax expense recorded due to expected repatriation of foreign earnings	1,000,000
Recognized interest and penalties related to uncertain tax positions	1,100,000	300,000
Accrued interest and penalties related to uncertain tax positions	7,600,000	7,500,000
Estimated range of change, upper bound	0
Estimated range of change, lower bound	20,000,000
Income tax examination, range of possible losses														24,300,000	50,200,000	61,600,000
Payment to taxing authority to pursue litigation															13,000,000
Taxes paid, net of refunds	$ 13,700,000	$ 9,200,000	$ 28,200,000