Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 134,782	$ 124,996
Foreign tax credits	137,818	218,026
Valuation allowance	135,000
Unrecognized tax benefits	66,768	47,534	$ 42,902
Reduction in provision for income taxes due to impact of effective tax rate	57,000	$ 44,000
Federal tax authority
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	251,000
Foreign tax credits	3,000
State tax authority
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	$ 256,000