Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details Textual)

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Income Taxes (Details Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Income Taxes (Textual)        
Unrecognized income taxes $ 18,660 $ 15,197 $ 23,857 $ 13,976
Gross unrecognized tax benefits, including interest and penalties 22,411 19,788    
Unrecognized tax benefit that if recognized would impact effective tax rate 16,274 14,339    
Accrued for interest and penalties $ 3,751 $ 4,591