Equity Investees (Schedule Of Operations For Equity Investees) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Revenues	$ 31,010	$ 33,324	$ 59,439	$ 61,854
Operating income	23,527	26,047	45,059	47,283
Net income	$ 22,385	$ 24,885	$ 42,749	$ 44,944