Leases - Supplemental Cash Flow (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 used for operating leases	$ 87,654	$ 86,452
Operating cash flows used for financing leases	67	69
Financing cash flows used for finance leases	1,473	1,418
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	74,305	2,369
Finance leases	$ 4,840	$ 1,695