Other Long-Term Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Cash surrender value of corporate-owned life insurance policies	$ 5,055	$ 4,654
Deferred commissions	36,489	32,455
Restricted cash	60	62
Operating lease assets	26,885	22,308
Prepaid expenses, deposits and other	15,755	8,727
Total other long-term assets	$ 84,244	$ 68,206