Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 37,320	$ 38,871
Fixed assets, net	378,745	450,108
Other assets	1,852	2,040
Total assets	417,917	491,019
Current liabilities	24,412	25,308
Other liabilities	217,543	231,032
Equity	175,962	234,679
Total liabilities and equity	$ 417,917	$ 491,019