Leases - Lease Expense Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 69,249	$ 41,049
Short-term lease cost	1,404	1,823
Variable lease cost	3,692	3,477
Less: sublease income	(2,265)	(4,492)
Total lease expense, net	72,080	41,857
Cash paid for operating leases	50,194	44,976
Lease obligations in exchange for obtaining right-of-use assets, operating leases	$ 75,244	$ 33,167
Weighted-average remaining term (in years) - operating leases	6 years 18 days	6 years 3 months 14 days
Weighted-average discount rate - operating leases	2.38%	2.92%