Income Taxes (Details 6)	12 Months Ended
	Dec. 31, 2011
United States [Member]
Income Tax Examination [Line Items]
Income tax years open to examination from	2008
Income Tax Examination, Year(s) under Examination	2011
Australia [Member]
Income Tax Examination [Line Items]
Income tax years open to examination from	2009
Income Tax Examination, Year(s) under Examination	2011
Canada [Member]
Income Tax Examination [Line Items]
Income tax years open to examination from	2007
Income Tax Examination, Year(s) under Examination	2011
Mexico [Member]
Income Tax Examination [Line Items]
Income tax years open to examination from	2006
Income Tax Examination, Year(s) under Examination	2011
Netherlands [Member]
Income Tax Examination [Line Items]
Income tax years open to examination from	2008
Income Tax Examination, Year(s) under Examination	2011