Interest (Schedule Of Capitalized Interest Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest [Abstract]
Interest capitalized beginning of period	$ 28,935	$ 21,533
Interest capitalized during period	7,734	6,380
Less: capitalized interest in cost of sales	(4,956)	(3,067)
Interest capitalized end of period	$ 31,713	$ 24,846