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Income Taxes
9 Months Ended
Sep. 30, 2015
Income Taxes [Abstract]  
Income Taxes

10. Income Taxes

At the end of each interim period we are required to estimate our annual effective tax rate for the fiscal year, and use that rate to provide for income taxes for the current year-to-date reporting period. Accordingly, we recorded income tax expense of $5.4 million, and $2.6 million for the three months ended September 30, 2015 and 2014, respectively. For the nine months ended September 30, 2015 and 2014, we recorded $13.2 million and $7.1 million of income tax expense, respectively. Our income tax expense for the three and nine months ended September 30, 2015 is based on our estimated annual effective tax rate of approximately 34.4% and certain discreet items, which benefited our effective tax rate by approximately 0.8% and 1.4% for the three and nine ended September 30, 2015, respectively.