Equity Investees And Other Investments (Schedule Of Balance Sheet Information For Equity Investees) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Equity Investees And Other Investments [Abstract]
Current Assets	$ 12,732	$ 16,402
Fixed Assets, net	441,894	459,490
Other Assets	18,000	15,424
Total Assets	472,626	491,316
Current Liabilities	5,891	5,509
Other Liabilities	8,536	3,876
Equity	458,199	481,931
Total Liabilities and Combined Equity	$ 472,626	$ 491,316