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Income Taxes	6 Months Ended
Income Taxes	Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Income tax expense totaled $25,292 and $10,681 for the second quarters of 2013 and 2012, representing effective tax rates of 36.6 percent and 22.1 percent during the respective periods. For the first six months of 2013, income tax expense totaled $56,353 compared to $29,035 during 2012. The effective tax rates for the six-month periods equals 36.2 percent and 28.4 percent, respectively. The lower effective tax rates for the second quarter and first six months of 2012 primarily result from recognition of a $6,449 credit to income tax expense resulting from the favorable outcome of state tax audits for the period 2008-2010, net of additional federal taxes.

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.

+ References

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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