Leases - Lease Cost and Other Information (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	$ 2,760	$ 2,834	$ 8,331	$ 8,417
Variable lease payments	17	311	256	1,137
Cash paid for amounts included in the measurement of operating lease liabilities	$ 802	$ 835	$ 2,412	$ 2,421