Income Taxes (Schedule of Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Allowance for doubtful accounts	$ 1,574	$ 2,008
Tax credits	1,444	3,417
Other accruals	143,387	97,189
Operating lease liability	513,134	494,093
Other	16,594	15,732
Total deferred tax assets	676,133	612,439
Deferred tax liabilities:
Inventories	79,326	65,346
Property and equipment	194,000	162,613
Operating lease asset	498,042	479,821
Other	60,664	37,939
Total deferred tax liabilities	832,032	745,719
Net deferred tax liabilities	$ (155,899)	$ (133,280)