Income Taxes (Schedule of provision for income tax expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current income tax expense
Federal	$ 600,499	$ 946,016	$ 517,272
State	91,965	152,758	116,448
Foreign	3,482	8,605	9,919
Total current	695,946	1,107,379	643,639
Deferred income tax expense
Federal	38,172	22,168	304,235
State	15,355	13,333	16,226
Foreign	2,138	(1,303)	(1,844)
Total deferred	55,665	34,198	318,617
Total income tax expense	$ 751,611	$ 1,141,577	$ 962,256