Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes (Details 4)

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Income Taxes (Details 4)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Federal statutory rate 35.00% 35.00% 35.00%
State income taxes, net of federal benefit 2.50% 2.10% 2.10%
Tax exempt interest income 0.00% 0.00% (0.80%)
Stock compensation expense 3.40% 0.60% 0.20%
Manufacturing deduction (5.90%) (2.70%) (3.50%)
Federal research and development tax credit 0.00% (1.60%) (1.90%)
Tax contingencies (3.50%) 0.40% 1.30%
Non-deductible acquisition expenses 12.90% 0.30% 0.00%
Difference in tax rates (3.40%) 0.00% 0.00%
Other 4.50% 0.10% (0.10%)
Effective income tax rate 52.30% 34.20% 32.30%