Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 16,907	$ 17,111
Fixed assets, net	224,996	232,736
Other assets	1,287	861
Total assets	243,190	250,708
Current liabilities	20,876	20,727
Other liabilities	227,762	219,644
Equity	(5,448)	10,337
Total liabilities and equity	$ 243,190	$ 250,708