Leases Lease Expense Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating lease cost:
Fixed lease expense	$ 541,090	$ 526,352
Variable lease expense	122,729	119,740
Financing lease cost:
Amortization of leased assets	24,720	23,724
Interest on lease liabilities	14,421	14,932
Net lease cost	$ 702,960	$ 684,748