Interest (Schedule Of Capitalized Interest Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest [Abstract]
Interest capitalized beginning of period	$ 31,713	$ 24,846	$ 28,935	$ 21,533
Interest capitalized during period	10,830	6,649	18,564	13,029
Less: capitalized interest in cost of sales	(6,875)	(4,918)	(11,831)	(7,985)
Interest capitalized end of period	$ 35,668	$ 26,577	$ 35,668	$ 26,577