Operating Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Operating lease cost	$ 3,589	$ 3,401	$ 7,135	$ 6,587
Variable lease cost	1,072	751	1,974	1,429
Total lease cost	4,661	4,152	9,109	8,016
Cash paid for amounts included in measurement of lease liabilities	$ 3,560	$ 2,184	$ 6,896	$ 4,397
Weighted average remaining lease term	6 years 8 months 12 days	7 years 4 months 24 days	6 years 8 months 12 days	7 years 4 months 24 days
Weighted average discount rate	5.30%	5.40%	5.30%	5.40%