Income Taxes (Schedule Of Components Of Income And Loss From Continuing Operations Before Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest [Abstract]
Domestic	$ (2,069,019)	$ 372,672	$ 165,463
Foreign	9,236	69,517	(64,706)
Income from continuing operations before income taxes	$ (2,059,783)	$ 442,189	$ 100,757