Income Taxes (Schedule of Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for doubtful accounts	$ 2,008	$ 1,944
Tax credits	3,417	5,606
Other accruals	97,189	105,894
Operating lease liability	494,093	0
Other	15,732	14,770
Total deferred tax assets	612,439	128,214
Deferred tax liabilities:
Inventories	65,346	62,846
Property and equipment	162,613	140,019
Operating lease asset	479,821	0
Other	37,939	30,915
Total deferred tax liabilities	745,719	233,780
Net deferred tax liabilities	$ (133,280)	$ (105,566)