Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Lease Cost
Operating lease costs	$ 14,476	$ 15,769	$ 40,965	$ 39,368
Short-term lease costs	398	768	1,361	1,778
Variable lease costs	3,368	3,730	9,579	9,563
Sublease income	(1,048)	(1,048)	(3,143)	(3,178)
Total lease cost, net	$ 17,194	$ 19,219	$ 48,762	$ 47,531