Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Equity Investees [Abstract]
Current assets	$ 65,330	$ 12,732
Fixed assets, net	734,697	441,894
Other assets	16,736	18,000
Total assets	816,763	472,626
Current liabilities	66,967	5,891
Other liabilities	108,506	8,536
Equity	641,290	458,199
Total liabilities and combined equity	$ 816,763	$ 472,626