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Income Taxes Schedule of Income before Income Tax, Domestic and Foreign (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Disclosure [Abstract]                      
Domestic                 $ 21,123 $ 10,551 $ 26,918
Foreign                 11,752 6,237 6,176
INCOME BEFORE INCOME TAXES $ 5,626 $ 6,507 $ 10,847 $ 10,210 $ 5,523 $ (3,442) $ 8,777 $ 6,346 $ 32,875 $ 16,788 $ 33,094