Income Taxes (Schedule of Income before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
United States	$ 2,789,064	$ 1,719,326	$ 845,402
Foreign	410,285	342,905	381,056
Income before income taxes	$ 3,199,349	$ 2,062,231	$ 1,226,458