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Income Taxes - Domestic and Foreign (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Disclosure [Abstract]                      
Domestic                 $ 15,958 $ 21,123 $ 10,551
Foreign                 11,660 11,752 6,237
INCOME BEFORE INCOME TAXES $ 4,330 $ 9,082 $ 8,222 $ 8,007 $ 5,626 $ 6,507 $ 10,847 $ 10,210 $ 27,618 $ 32,875 $ 16,788