Operating Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 3,832	$ 3,479	$ 10,967	$ 10,066
Variable lease cost	998	691	2,972	2,120
Total lease cost	4,830	4,170	13,939	12,186
Cash paid for amounts included in measurement of lease liabilities	$ 3,327	$ 2,732	$ 10,223	$ 7,129
Weighted average remaining lease term	6 years 3 months 18 days	7 years 3 months 18 days	6 years 3 months 18 days	7 years 3 months 18 days
Weighted average discount rate	5.20%	5.40%	5.20%	5.40%