Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Income Taxes        
Income tax provision $ 20,065 $ 15,583 $ 33,115 $ 27,116
Effective income tax rate 38.60% 38.70% 38.80% 39.00%
Federal statutory rate     35.00%  
Adjustments to tax liability $ 0   $ 0