Income Taxes (Reconciliation Of Income Tax Expense (Benefit))(Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income taxes at statutory rate	$ 461,250	$ 434,394	$ 262,102
State and local income taxes, net of federal income tax benefit	10,133	6,298	4,951
Foreign income taxes	(113,520)	(111,217)	(95,198)
Change in valuation allowance	10,008	(21,106)	(14,237)
2017 revaluation of deferred tax assets and liabilities	(150,546)	0	0
Deemed Repatriation Transition Tax	105,165	0	0
Tax contingencies and audit settlements	23,097	2,496	(23,032)
Other, net	(2,422)	(3,306)	(2,711)
Income tax expense (benefit)	$ 343,165	$ 307,559	$ 131,875