Equity Investees (Schedule Of Balance Sheet Information For Equity Investees) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Equity Method Investments and Joint Ventures [Abstract]
Current assets	$ 83,886	$ 74,906
Fixed assets, net	1,021,106	832,525
Other assets	7,727	10,202
Total assets	1,112,719	917,633
Current liabilities	78,979	112,321
Other liabilities	182,210	134,731
Equity	851,530	670,581
Total liabilities and equity	$ 1,112,719	$ 917,633