XML 15 R26.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Income Taxes (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Income Taxes        
Effective income tax rate (as a percent) 35.00% 35.10% 34.20% 33.70%
U.S federal statutory rate (as a percent)     35.00%