Equity Investees (Schedule Of Operations For Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Revenues	$ 31,219	$ 30,830	$ 90,658	$ 92,684
Operating income	23,107	23,839	68,166	71,122
Net income	$ 21,921	$ 22,860	$ 64,670	$ 67,804