Organization and Summary of Significant Accounting Policies - Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets
Deferred compensation plan assets	$ 17,074	$ 15,053
Investments in privately held companies	12,043	17,129
Long-term notes receivable	2,196	2,722
Other	6,363	6,557
Total Other Assets	$ 37,676	$ 41,461