Leases - Components of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease cost	$ 16,735	$ 16,828
Sublease (income)	(15)	(361)
Net lease cost	$ 16,720	$ 16,467	$ 14,500