Income taxes	3 Months Ended
Mar. 31, 2016
Income taxes
Income taxes	Note 4. Income taxes For the three months ended March 31, 2016 and 2015, our income tax expense has been computed utilizing the estimated annual effective rates of 35.8% and 39.5%, respectively. The difference between the annual effective rate of 35.8% and the statutory Federal income tax rate of 35% in the three month period in 2016 is primarily due to state and foreign income taxes. The difference between the actual effective rate of 39.5% and the statutory Federal income tax rate of 35% in the three-month period in 2015, is primarily due to state income taxes. Income tax expense for the three months ended March 31, 2016 and 2015 was $1.5 million and $1.6 million, respectively.

Income taxes

3 Months Ended

Mar. 31, 2016

Note 4. Income taxes

For the three months ended March 31, 2016 and 2015, our income tax expense has been computed utilizing the estimated annual effective rates of 35.8% and 39.5%, respectively. The difference between the annual effective rate of 35.8% and the statutory Federal income tax rate of 35% in the three month period in 2016 is primarily due to state and foreign income taxes. The difference between the actual effective rate of 39.5% and the statutory Federal income tax rate of 35% in the three-month period in 2015, is primarily due to state income taxes.

Income tax expense for the three months ended March 31, 2016 and 2015 was $1.5 million and $1.6 million, respectively.