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Income Taxes (Details Textual) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Mar. 31, 2011 USD ($)	Jun. 30, 2012 USD ($)	Jun. 30, 2012 CAD	Jun. 30, 2011 USD ($)
Income Taxes (Textual) [Abstract]
Letter of credit collateralized			7.3
Potential cash tax liability full amount for the proposed adjustment		15.2
Unrecognized tax benefits		1.6
Provision for deferred income taxes on undistributed earnings of subsidiary				2.1
U.S. Federal statutory income tax rate		35.00%	35.00%
Patent litigation settlement gain	$ 7.5			$ 7.5

X

- Definition

Amount of deferred tax liability attributable to taxable temporary differences from undistributed earnings of subsidiaries and other recognized entities not within the country of domicile of the entity.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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Potential cash tax liability full amount for the proposed adjustment.

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Proceeds from legal settlement related to patent claims.

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