Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows for operating leases	$ 219,754	$ 205,977
Operating cash flows for finance leases	775	758
Financing cash flows for finance leases	273	103
Right-of-use assets obtained in exchange for lease liabilities:
Operating leases	215,568	168,863
Finance leases	$ 436	$ 1,198