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Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Note To Financial Statement Details Textual      
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 35.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability     $ 3.8
Effective Income Tax Rate Reconciliation, Percent, Total 22.70% 15.90% 37.80%
Amount of deferred tax liability that can potentially offest deferred tax assets $ 26.9    
Deferred Tax Assets, Valuation Allowance, Total 0.0 $ 0.0  
Income Tax Examination, Penalties and Interest Expense, Total $ 0.0 $ 0.0 $ 0.0