Equity Investees (Schedule Of Operations For Equity Investees) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Equity Method Investments and Joint Ventures [Abstract]
Revenues	$ 39,799	$ 7,975	$ 113,769	$ 32,819
Operating income	19,810	576	53,597	11,768
Net income	$ 19,196	$ 576	$ 51,553	$ 11,778