Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Deferred tax asset valuation allowance	$ 318,408	$ 249,844
Unrecognized tax benefits	202,557	140,124	$ 66,768
Reduction in provision for income taxes due to impact of effective tax rate	136,000	$ 86,000
Federal tax authority
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	274,000
State tax authority
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, amount	$ 456,000