Equity Investees (Schedule Of Operations For Equity Investees) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]
Revenues	$ 46,440	$ 45,528	$ 96,264	$ 86,268
Operating income	22,628	26,427	53,103	47,527
Net income	$ 21,815	$ 25,748	$ 51,521	$ 46,203