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Income Tax Provision (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Income Tax Provision        
Income tax provision (benefit) $ 4,404,000 $ 11,764,000 $ 7,410,000 $ 16,353,000
Effective income tax rate 41.00% 40.30% 42.70% 33.10%
Tax benefit due to a higher ratio of foreign losses $ 0