Summary of Significant Accounting Policies - Leases Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accounting Policies [Abstract]
Operating lease cost	$ 140,551	$ 122,737	$ 408,312	$ 365,303
Depreciation of financing lease right-of-use assets	14,006	12,973	39,062	38,495
Interest expense for financing lease liabilities	5,055	4,891	14,940	14,664
Variable lease costs	$ 28,835	$ 27,486	$ 86,422	$ 82,287