Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal, Current (expense) benefit	$ (34,842)	$ (13,601)	$ (4,643)
State, Current (expense) benefit	(240)	(156)	14
Foreign, including foreign withholding tax, Current (expense) benefit	(19,268)	(17,241)	(69,614)
Current (expense) benefit	54,350	30,998	74,243
Federal, Deferred (expense) benefit	(64,301)	(65,168)	(76,614)
State, Deferred (expense) benefit	(21,492)	(15,767)	(15,402)
Foreign, Deferred (expense) benefit	(385)	(481)	38,208
Deferred (expense) benefit	86,178	81,416	53,808
Income tax (expense) benefit	$ 140,528	$ 112,414	$ 128,051