Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 38,871	$ 42,135
Fixed assets, net	450,108	1,015,305
Equity Method Investment, Summarized Financial Information, Noncurrent Assets	2,040	4,369
Total assets	491,019	1,061,809
Current liabilities	25,308	25,369
Other liabilities	231,032	202,613
Equity	234,679	833,827
Total liabilities and equity	$ 491,019	$ 1,061,809