Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 69,945	$ 74,906
Fixed assets, net	1,009,544	832,525
Other assets	8,591	10,202
Total assets	1,088,080	917,633
Current liabilities	70,766	112,321
Other liabilities	164,210	134,731
Equity	853,104	670,581
Total liabilities and equity	$ 1,088,080	$ 917,633