17.

Income Taxes

The Company's provision for income taxes is based upon estimated annual tax rates for the year applied to federal, state and foreign income. The provision for income taxes increased to $23.1 million in the second quarter of 2011 from $19.0 million in the second quarter of 2010. The effective tax rate decreased to 31.5% for the second quarter of 2011 compared to 32.0% in the second quarter of 2010 due to the mix of global pre-tax income among jurisdictions.

The provision for income taxes increased to $45.5 million in the first six months of 2011 from $37.1 million in the same period of 2010. The effective tax rate decreased to 31.7% for the first six months of 2011 compared to 32.5% in the same period of 2010 due to the mix of global pre-tax income among jurisdictions.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction, and various state and foreign jurisdictions. Due to the potential for resolution of federal, state and foreign examinations, and the expiration of various statutes of limitation, it is reasonably possible that the Company's gross unrecognized tax benefits balance may change within the next twelve months by a range of zero to $0.9 million.