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Income Taxes (Tax credit carryforwards) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
U.S. Federal | U.S. Foreign Tax Credits    
Tax Credit Carryforward [Line Items]    
Tax Credits $ 70,265 $ 77,983
U.S. Federal | U.S. Other Tax Credits    
Tax Credit Carryforward [Line Items]    
Tax Credits 168 1,404
Foreign    
Tax Credit Carryforward [Line Items]    
Tax Credits $ 22,623 $ 18,771