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Income Taxes (Details 3) (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
Reconciliation of income tax provision (benefit) to the amount computed by multiplying book income/(loss) before income taxes by federal income tax rate                      
Tax at statutory rate                 $ (436) $ 9,861 $ 8,889
Permanent differences                 4,534 572 464
State taxes, net of federal benefit                 1,086 1,067 1,191
Effect of foreign tax rates                 8 (71) (24)
Uncertain tax positions                 (8,104)    
Recognition of tax credits                 (432) (903) (526)
Other                 (276) 174 (173)
Income tax expense before change in valuation allowance                 (3,620) 10,700 9,821
Change in valuation allowance                     (51)
Income tax (benefit) expense (10,140) 2,504 2,801 1,215 1,766 3,427 3,235 2,272 (3,620) 10,700 9,770
Taxes paid for United States federal, state and foreign income taxes                 $ 3,651 $ 7,507 $ 7,270