Income Taxes (Components Of Income Tax Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Domestic, current	$ 139,597	$ 77,936	$ (19,255)
Foreign, current	23,364	41,833	29,882
Total current tax expense	162,961	119,769	10,627
Domestic, deferred	217,928	(77,255)	(222,427)
Foreign, deferred	105,457	79,984	(101,663)
Total deferred tax expense (benefit)	323,385	2,729	(324,090)
Income tax expense (benefit)	$ 486,346	$ 122,498	$ (313,463)