Interest (Schedule Of Capitalized Interest Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest [Abstract]
Interest capitalized beginning of period	$ 35,668	$ 26,577	$ 28,935	$ 21,533
Interest capitalized during period	13,338	6,743	31,902	19,772
Less: capitalized interest in cost of sales	(8,794)	(5,192)	(20,625)	(13,177)
Interest capitalized end of period	$ 40,212	$ 28,128	$ 40,212	$ 28,128