Operating Lease Right-of-Use Assets and Liabilities - Components of Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Lease expense	$ 27,035	$ 39,724
Short-term and variable lease cost	709	732
Sublease income	(1,491)	(1,716)
Total lease cost for operating leases	$ 26,253	$ 38,740