Equity Investees (Schedule Of Operations For Equity Investees) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Equity Method Investments and Joint Ventures [Abstract]
Revenues	$ 36,452	$ 9,835	$ 73,970	$ 24,844
Operating income	14,391	2,783	33,787	11,192
Net income	$ 13,682	$ 2,783	$ 32,357	$ 11,202