Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating loss and tax credit carryforwards
Valuation allowance, deferred tax asset, decrease	$ 177,900
Unrecognized tax benefits	184,921	$ 164,531	$ 146,215	$ 134,044
Long-term income taxes payable
Operating loss and tax credit carryforwards
Unrecognized tax benefits	78,900	$ 1,300
State and local tax authority | California Franchise Tax Board
Operating loss and tax credit carryforwards
Operating loss carryforwards	167,700
Tax credit carryforwards, alternative minimum tax credit	500
State and local tax authority | Other
Operating loss and tax credit carryforwards
Operating loss carryforwards	800
Research and development tax credit carryforward | Federal
Operating loss and tax credit carryforwards
Tax credit carryforwards	45,200
Research and development tax credit carryforward | State and local tax authority | California Franchise Tax Board
Operating loss and tax credit carryforwards
Tax credit carryforwards	28,100
Foreign tax credit
Operating loss and tax credit carryforwards
Tax credit carryforwards	10,100
Foreign tax credit | Federal
Operating loss and tax credit carryforwards
Tax credit carryforward, subject to expiration	$ 3,900