Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 50,963	$ 42,135
Fixed assets, net	989,168	1,015,305
Other assets	1,938	4,369
Total assets	1,042,069	1,061,809
Current liabilities	26,521	25,369
Other liabilities	202,633	202,613
Equity	812,915	833,827
Total liabilities and equity	$ 1,042,069	$ 1,061,809