Income Taxes	9 Months Ended
Sep. 30, 2011
Income Taxes [Abstract]
Income Taxes	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 decreased to $14.8 million in the third quarter of 2011 from $18.6 million in the third quarter of 2010. The effective tax rate decreased to 23.4% for the third quarter of 2011 compared to 32.6% in the third quarter of 2010 primarily due to the mix of global pre-tax income among jurisdictions and as a result of recent acquisitions. The provision for income taxes increased to $60.2 million in the first nine months of 2011 from $55.7 million in the same period of 2010. The effective tax rate decreased to 29.1% for the first nine months of 2011 compared to 32.5% in the same period of 2010 primarily due to the mix of global pre-tax income among jurisdictions and as a result of recent acquisitions. The Company and its subsidiaries file U.S. federal income tax returns and various state and foreign income tax returns. 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 $3.1 million.

Income Taxes

9 Months Ended

Sep. 30, 2011

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 decreased to $14.8 million in the third quarter of 2011 from $18.6 million in the third quarter of 2010. The effective tax rate decreased to 23.4% for the third quarter of 2011 compared to 32.6% in the third quarter of 2010 primarily due to the mix of global pre-tax income among jurisdictions and as a result of recent acquisitions.

The provision for income taxes increased to $60.2 million in the first nine months of 2011 from $55.7 million in the same period of 2010. The effective tax rate decreased to 29.1% for the first nine months of 2011 compared to 32.5% in the same period of 2010 primarily due to the mix of global pre-tax income among jurisdictions and as a result of recent acquisitions.

The Company and its subsidiaries file U.S. federal income tax returns and various state and foreign income tax returns. 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 $3.1 million.