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Income Taxes (Details)	3 Months Ended
Income Taxes (Details)	Mar. 31, 2013
United States - Federal [Member]
Summary of tax years that remain subject to examination by major jurisdiction
Examinations not yet initiated	2009 – 2012
United States - State [Member]
Summary of tax years that remain subject to examination by major jurisdiction
Examinations not yet initiated	2008 – 2012
Examination in progress	2009
Canada [Member]
Summary of tax years that remain subject to examination by major jurisdiction
Examinations not yet initiated	2010 – 2012
Examination in progress	2007 – 2011
Germany [Member]
Summary of tax years that remain subject to examination by major jurisdiction
Examinations not yet initiated	2007, 2010 – 2012
Examination in progress	2008 – 2011
France [Member]
Summary of tax years that remain subject to examination by major jurisdiction
Examinations not yet initiated	2010 – 2012
United Kingdom [Member]
Summary of tax years that remain subject to examination by major jurisdiction
Examinations not yet initiated	2009 – 2012
Philippines [Member]
Summary of tax years that remain subject to examination by major jurisdiction
Examinations not yet initiated	2011 – 2012
Examination in progress	2010