Quarterly report pursuant to Section 13 or 15(d)

Income Taxes

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Income Taxes
 6 Months Ended
Jun. 30, 2012
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes

The Company or one of its subsidiaries files income tax returns in the U.S. federal jurisdiction, various states and Canada. With a few exceptions, the Company is no longer subject to U.S. federal, state and local, or Canadian examinations by tax authorities for years before 2007.

For the six months ended June 30, 2012 and 2011, the effective income tax rates varied from the statutory federal income tax rate of 35.0%, primarily as a result of the effect of state income taxes, net of the federal benefit and permanent differences between book and tax net income.