Leases - Lease Cost and Other Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Cash Flow, Operating Activities, Lessee [Abstract]
Cash paid for operating lease liabilities	$ 45,531	$ 41,539
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 8,467	$ 18,134
Weighted average remaining lease term:
Weighted average remaining lease term for operating leases	4 years 3 months 18 days		4 years 6 months
Operating Leases, Weighted Average Discount Rate, Percent [Abstract]
Weighted average discount rate for operating leases	2.50%		2.60%