Income Taxes (Open Years For Income Tax Audit Purposes In Major Taxing Jurisdictions) (Details)	6 Months Ended
	Jun. 30, 2012
U.S. Federal [Member]
Income Tax Contingency [Line Items]
Open income tax years by major tax jurisdiction	2008 and forward
Canada Federal [Member]
Income Tax Contingency [Line Items]
Open income tax years by major tax jurisdiction	2007 and forward
Ontario Provincial [Member]
Income Tax Contingency [Line Items]
Open income tax years by major tax jurisdiction	2005 and forward
Massachusetts [Member]
Income Tax Contingency [Line Items]
Open income tax years by major tax jurisdiction	2008 and forward
North Carolina [Member]
Income Tax Contingency [Line Items]
Open income tax years by major tax jurisdiction	2008 and forward
New York [Member]
Income Tax Contingency [Line Items]
Open income tax years by major tax jurisdiction	2008 and forward
Illinois [Member]
Income Tax Contingency [Line Items]
Open income tax years by major tax jurisdiction	2008 and forward
Georgia [Member]
Income Tax Contingency [Line Items]
Open income tax years by major tax jurisdiction	2008 and forward