Income Taxes (Schedule of Earnings Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ 437,039	$ 529,451	$ 587,346
Foreign	(34,660)	(43,265)	32,927
Income from operations before income taxes	$ 402,379	$ 486,186	$ 620,273