Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current, federal	$ (101,578)	$ (952)	$ 150,997
Current, state	(159)	2,818	11,339
Current, foreign	19,156	19,227	36,287
Current, total	(82,581)	21,093	198,623
Deferred, federal	(179,721)	(249,193)	(33,172)
Deferred, state	(9,348)	(10,034)	648
Deferred, foreign	4,649	(13,886)	(4,700)
Deferred income taxes	(184,420)	(273,113)	(37,224)
Income Tax Expense (Benefit), Total	$ (267,001)	$ (252,020)	$ 161,399