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 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Income Taxes [Abstract]        
Income tax provision $ 14,968 $ 9,821 $ 48,083 $ 36,938
Effective income tax rate 38.10% 39.80% 38.60% 39.20%
Federal statutory rate     35.00%  
Adjustments to tax liability $ 0   $ 0