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Income Taxes (Reconciliations Of U.S. Federal Statutory Rate To The Effective Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Taxes [Abstract]      
Tax provision at U.S. federal statutory rates 35.00% 35.00% 35.00%
State taxes 4.00% 1.40% 2.00%
Foreign taxes and foreign losses with tax benefit (0.60%) (13.30%) (19.10%)
Change in U.S. valuation allowance 0.40% (0.20%) (0.30%)
Research and development credits (4.30%) (3.50%) (2.10%)
Section 199 benefit (2.70%) [1]    
Stock-based compensation expense 6.70% [1]    
Other 2.10% (3.70%) 3.50%
Effective income tax rate 40.60% 15.70% 19.00%
[1] For 2010 and 2009, the impact of Section 199 benefit and stock-based compensation expense were not separately disclosed as these were not material to the overall effective tax rate.