Income Taxes (Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current income taxes:
Current income taxes: U.S. federal	$ 19,936	$ 22,700	$ 327,697
Current income taxes: State and local	12,659	14,521	17,811
Current income taxes: Foreign	80,221	58,669	73,248
Total current income taxes	112,816	95,890	418,756
Deferred income taxes:
Deferred income taxes: U.S. federal	11,993	54,983	(17,419)
Deferred income taxes: State and local	15,371	19,076	(3,046)
Deferred income taxes: Foreign	(135,206)	14,397	(55,126)
Total deferred income taxes	(107,842)	88,456	(75,591)
Income tax expense (benefit)	$ 4,974	$ 184,346	$ 343,165