Equity Investees (Schedule Of Operations For Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity Method Investments and Joint Ventures [Abstract]
Revenues	$ 73,281	$ 74,801	$ 227,924	$ 171,065
Operating income	45,496	46,096	150,017	99,199
Net income	$ 34,195	$ 44,881	$ 136,342	$ 96,402