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Income Taxes - Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
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]                    
Taxes at federal statutory rate               $ 3,054 $ 143 $ (1,504)
State taxes, net of federal benefit               (23) (323) (284)
Effect of tax rate differential for foreign subsidiary               (2,695) (1,576) (1,356)
Valuation allowance, including tax benefits of stock activity               (8,034) 2,201 4,123
Nondeductible interest               0 462 (313)
Foreign tax credit               0 0 (183)
Stock-based compensation               242 73 155
FCPA settlement               0 0 1,156
Return to provision adjustments               3,568 576 (1,512)
Subpart F income inclusion               5,594 0 948
Other               643 300 401
Tax provision $ 416 $ 719 $ 714 $ 635 $ 922 $ (427) $ 726 $ 2,349 $ 1,856 $ 1,631