Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating loss and tax credit carryforwards
Unrecognized tax benefits	$ 164,531	$ 146,215	$ 134,044	$ 115,653
State and local tax authority | California Franchise Tax Board
Operating loss and tax credit carryforwards
Operating loss carryforwards	191,700
Tax credit carryforwards, alternative minimum tax credit	300
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	41,800
Research and development tax credit carryforward | State and local tax authority | California Franchise Tax Board
Operating loss and tax credit carryforwards
Tax credit carryforwards	25,600
Foreign tax credit
Operating loss and tax credit carryforwards
Tax credit carryforwards	51,200
Foreign tax credit | Federal
Operating loss and tax credit carryforwards
Tax credit carryforward, subject to expiration	$ 10,800