Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 66,739	$ 12,732
Fixed assets, net	757,389	441,894
Other assets	11,692	18,000
Total assets	835,820	472,626
Current liabilities	52,647	5,891
Other liabilities	118,546	8,536
Equity	664,627	458,199
Total liabilities and combined equity	$ 835,820	$ 472,626