Leases - Components of Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 28,337	$ 35,335
Short-term lease cost	534	885
Sublease income	(2,240)	(2,696)
Total lease costs	26,631	33,524
Right of use asset impairment charge	$ 800	$ 6,000
Weighted average remaining lease term (years)	5 years 7 months 6 days	5 years 8 months 12 days
Weighted average discount rate	4.37%	4.15%
Cash paid for amounts included in the measurement of lease liabilities	$ 32,510	$ 32,883
Right-of-use assets obtained in exchange for operating lease liabilities	$ 12,763	$ 4,431