Leases - Lease Cost and Other Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Cash Flow, Operating Activities, Lessee [Abstract]
Cash paid for operating lease liabilities	$ 62,873	$ 57,912
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 34,530	$ 25,137
Weighted average remaining lease term:
Weighted average remaining lease term for operating leases	4 years 8 months 12 days		4 years 9 months 18 days
Operating Leases, Weighted Average Discount Rate, Percent [Abstract]
Weighted average discount rate for operating leases	2.70%		3.00%