Equity Investees (Schedule Of Operations For Equity Investees) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]
Revenues	$ 74,801	$ 49,239	$ 171,065	$ 135,507
Operating income	46,096	28,419	99,199	75,946
Net income	$ 44,881	$ 27,725	$ 96,402	$ 73,928