Income Taxes (Narrative) (Details) (USD $)	3 Months Ended		12 Months Ended		3 Months Ended					3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011 German Tax Authority [Member]	Mar. 31, 2012 German Tax Authority [Member]	Mar. 31, 2012 German Tax Authority [Member] Minimum [Member]	Mar. 31, 2012 German Tax Authority [Member] Maximum [Member]	Mar. 31, 2012 Canadian Revenue Agency [Member]	Mar. 31, 2012 Canadian Revenue Agency [Member] Settlement of Tax Examination [Member]	Mar. 31, 2012 Canadian Revenue Agency [Member] Letter of Credit [Member]	Mar. 31, 2012 Canadian Revenue Agency [Member] Minimum [Member]	Mar. 31, 2012 Canadian Revenue Agency [Member] Maximum [Member]
Income Taxes [Abstract]
Effective tax rate on continuing operations	31.00%	31.00%
Discrete tax benefit principally related to the resolution of tax audits	$ (6,733,000)	$ (1,413,000)
Estimated range of change, upper bound	0
Estimated range of change, lower bound	(300,000)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized tax benefits				22,900,000
Discrete tax benefit related to settlement							7,000,000
Years under examination					2000	2003				2001	2008
Payment to taxing authority to pursue litigation			13,300,000
Refund from tax settlement							1,500,000
Reduction of deferred tax asset								2,700,000
Short-term debt									50,000,000
Amount of reasonably possible benefit	$ 8,700,000