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Income Taxes (Details Textual)
In Millions, unless otherwise specified
Jun. 30, 2012
USD ($)
Jun. 30, 2012
CAD
Jun. 30, 2012
Maximum [Member]
USD ($)
Income Taxes (Textual) [Abstract]      
Letter of credit $ 15.0 7.3  
Possible cash tax liability     $ 15.2