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Income Taxes
9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract] 
Income Taxes
8. Income Taxes
(8)   The Company uses the liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the differences between financial reporting and tax bases of assets and liabilities, and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. In July 2011, the Company received satisfactory resolution of certain tax matters which resulted in a reduction in tax expense of $2,480 in the third quarter of 2011. The full year 2011 effective tax rate is now expected to be approximately 36 percent.