Income Taxes	6 Months Ended
Jun. 30, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The provision for income taxes was $25.0 million for the three months ended June 30, 2013 compared to $19.0 million in the three months ended June 30, 2012. The effective tax rate was 35.0% for the three months ended June 30, 2013 and 31.4% for the same period in 2012. The increase in the effective tax rate was primarily due to a change in the estimated annual mix of pre-tax income by jurisdiction as well as the impact of certain state tax credits recognized in the three months ended June 30, 2012. The provision for income taxes was $40.2 million for the six months ended June 30, 2013 compared to $35.2 million in the six months ended June 30, 2012. The effective tax rate was 32.6% for the six months ended June 30, 2013 and 31.7% for the same period in 2012. The increase in the effective tax rate was primarily due to a change in the estimated annual mix of pre-tax income by jurisdiction and the benefit recognized in 2012 for the impact of state tax credits noted above. These items were partially offset by a benefit recognized in the first half of 2013 for the enactment of The American Taxpayer Relief Act of 2012. As of June 30, 2013 and December 31, 2012, the Company had gross unrecognized tax benefits of $18.4 million and $17.6 million, respectively. The unrecognized tax benefits relate primarily to the utilization of certain tax attributes. It is reasonably possible that the gross unrecognized tax benefits will decrease by $3.7 million within the next 12 months, due to anticipated closure of audits and the expiration of certain statutes of limitation. The Company classifies uncertain tax positions not expected to be settled within one year as long term liabilities. As of June 30, 2013 and December 31, 2012, the Company had Other liabilities of $14.7 million and $13.1 million, respectively, related to long term uncertain tax positions. In July 2013 the Internal Revenue Service closed its audit of the Company's federal income tax returns for the 2008 and 2009 tax years. The resolution of the audit did not result in any material adjustments to the Company's consolidated financial statements.

Income Taxes

6 Months Ended

Jun. 30, 2013

The provision for income taxes was $25.0 million for the three months ended June 30, 2013 compared to $19.0 million in the three months ended June 30, 2012. The effective tax rate was 35.0% for the three months ended June 30, 2013 and 31.4% for the same period in 2012. The increase in the effective tax rate was primarily due to a change in the estimated annual mix of pre-tax income by jurisdiction as well as the impact of certain state tax credits recognized in the three months ended June 30, 2012.

The provision for income taxes was $40.2 million for the six months ended June 30, 2013 compared to $35.2 million in the six months ended June 30, 2012. The effective tax rate was 32.6% for the six months ended June 30, 2013 and 31.7% for the same period in 2012. The increase in the effective tax rate was primarily due to a change in the estimated annual mix of pre-tax income by jurisdiction and the benefit recognized in 2012 for the impact of state tax credits noted above. These items were partially offset by a benefit recognized in the first half of 2013 for the enactment of The American Taxpayer Relief Act of 2012.

As of June 30, 2013 and December 31, 2012, the Company had gross unrecognized tax benefits of $18.4 million and $17.6 million, respectively. The unrecognized tax benefits relate primarily to the utilization of certain tax attributes. It is reasonably possible that the gross unrecognized tax benefits will decrease by $3.7 million within the next 12 months, due to anticipated closure of audits and the expiration of certain statutes of limitation. The Company classifies uncertain tax positions not expected to be settled within one year as long term liabilities. As of June 30, 2013 and December 31, 2012, the Company had Other liabilities of $14.7 million and $13.1 million, respectively, related to long term uncertain tax positions.

In July 2013 the Internal Revenue Service closed its audit of the Company's federal income tax returns for the 2008 and 2009 tax years. The resolution of the audit did not result in any material adjustments to the Company's consolidated financial statements.