Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 2)

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Income Taxes (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of gross unrecognized income tax benefits      
Unrecognized tax benefits at beginning of period $ 5,250 $ 5,413 $ 6,818
Gross increases - tax positions in prior period 4,467 257  
Gross decreases - tax positions in prior period (472) (420) (1,405)
Unrecognized tax benefits at end of period $ 9,245 $ 5,250 $ 5,413