Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 34,168	$ 42,135
Fixed assets, net	546,311	1,015,305
Other assets	2,776	4,369
Total assets	583,255	1,061,809
Current liabilities	10,718	25,369
Other liabilities	222,729	202,613
Equity	349,808	833,827
Total liabilities and equity	$ 583,255	$ 1,061,809