Interest (Schedule Of Capitalized Interest Costs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest [Abstract]
Interest capitalized beginning of period	$ 41,762	$ 28,935
Interest capitalized during period	13,357	7,734
Less: capitalized interest in cost of sales	(8,959)	(4,956)
Interest capitalized end of period	$ 46,160	$ 31,713