Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 12,887	$ 17,111
Fixed assets, net	228,875	232,736
Other assets	793	861
Total assets	242,555	250,708
Current liabilities	17,797	20,727
Other liabilities	222,886	219,644
Equity	1,872	10,337
Total liabilities and equity	$ 242,555	$ 250,708