Income Taxes	3 Months Ended
Mar. 31, 2013
Income Taxes	5. INCOME TAXES The Company’s effective tax rate was approximately 37% and 42% for the three months ended March 31, 2013 and 2012, respectively. The Company’s effective tax rate in the current quarter was lower than the prior year quarter mainly due to a change in apportionment methodology for certain states and the effect of a favorable benefit related to the federal research and development tax credit totaling approximately $0.4 million for the year ended December 31, 2012, which was recognized in the current quarter, and approximately $0.1 million for the three-month period ended March 31, 2013. On January 2, 2013, the American Taxpayer Relief Act of 2012 (the “Act”) was signed into law. The Act retroactively extended the federal research and development credit under Internal Revenue Code Section 41 (which previously expired at the end of 2011) through the end of 2013. In accordance with authoritative accounting guidance, the Company recognized the impact of this legislation for the 2012 tax year in the first quarter of 2013, when the Act was signed into law.

Income Taxes

3 Months Ended

Mar. 31, 2013

5. INCOME TAXES

The Company’s effective tax rate was approximately 37% and 42% for the three months ended March 31, 2013 and 2012, respectively. The Company’s effective tax rate in the current quarter was lower than the prior year quarter mainly due to a change in apportionment methodology for certain states and the effect of a favorable benefit related to the federal research and development tax credit totaling approximately $0.4 million for the year ended December 31, 2012, which was recognized in the current quarter, and approximately $0.1 million for the three-month period ended March 31, 2013. On January 2, 2013, the American Taxpayer Relief Act of 2012 (the “Act”) was signed into law. The Act retroactively extended the federal research and development credit under Internal Revenue Code Section 41 (which previously expired at the end of 2011) through the end of 2013. In accordance with authoritative accounting guidance, the Company recognized the impact of this legislation for the 2012 tax year in the first quarter of 2013, when the Act was signed into law.