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Income Taxes - Effective Income Tax Rate Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Tax expense at U.S. federal statutory rates $ 43,003 $ 18,278 $ 9,681
State income taxes, net of federal benefit 723 551 890
Foreign tax benefit (20,515) (3,859) (1,466)
Research and experimentation benefit (2,908) (1,065) (1,225)
Foreign tax credit benefit (4,465) 0 0
Tax audit settlements and lapses of statutes of limitations (509) 1,097 (1,328)
Stock compensation 1,683 1,565 465
Non-deductible items 1,597 2,788 1,250
Release of valuation allowance 0 (20,400) (3,886)
Other 619 (281) 636
Total income tax expense (benefit) $ 19,228 $ (1,326) $ 5,017