Annual report pursuant to Section 13 and 15(d)

Income Taxes - Effective Tax Rates Differ from Statutory Federal Income Tax (Details)

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Income Taxes - Effective Tax Rates Differ from Statutory Federal Income Tax (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Statutory Federal Income Tax Rate 21.00% 21.00% 35.00%
Stock Compensation Expense (0.50%) (0.90%) 1.10%
Domestic Production Activity Deduction 0.00% 0.00% (4.70%)
Other 0.50% 0.40% 0.50%
Foreign Tax Rate Differential 1.40% 0.50% (5.60%)
State Income Tax, Net of Federal Income Tax Effect 6.00% 2.80% 4.50%
Revised State Filing Tax Benefit, Net of Federal Income Tax Effect, Net of Reserve 0.00% (6.70%) 0.00%
Research and Development Tax Credits (4.60%) (6.20%) (11.50%)
Change in Valuation Allowance 1.10% 0.00% 0.00%
Net GILTI and FDII Tax Expense (Benefit) (0.012) 0.002 0
Tax Expense (Benefit) on Deemed Repatriation of Foreign Earnings 0.00% (0.80%) 5.60%
Revaluation of Deferred Taxes for Federal Tax Rate Change 0.00% (0.10%) (3.50%)
Other 0.10% 0.30% (0.10%)
Effective Tax Rate 23.80% 10.50% 21.30%