Supplemental Disclosure to Cash Flows - Summary of Supplemental Non-Cash and Other Cash Flow Information (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract]
Cash and cash equivalents	$ 155,440	$ 172,250	$ 349,462
Restricted cash	111	105	1,565
Total cash, cash equivalents and restricted cash shown in the statements of cash flows	155,551	172,355	351,027	$ 78,438
Cash paid for income taxes, net of refunds	10,893	3,669	10,609
Non-cash transactions:
Property and equipment purchases in accounts payable	$ 878	834	$ 501
Non-cash purchase consideration related to business combinations			12,508
Commission payable converted to stock-based award		$ 314