Balance Sheet Components, Other Non-Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]
Deferred income taxes	$ 20,911	$ 11,108
Deferred employer FICA payments	5,523	0
Other non-current liabilities	10,443	8,680
Non-current software accrual	5,748	5,226
Deferred compensation liability	7,456	5,566
Total	$ 50,081	$ 30,580