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Income Taxes	9 Months Ended
	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes During the second quarter of 2012, the Company determined to invest indefinitely a portion of its 2012 earnings from its foreign operations in the acquisition and expansion of SM Canada. As a result of this investment, the Company's effective income tax rate decreased to 35.4% and 35.1% for the three and nine months ended September 30, 2012, respectively.

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The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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