Interest (Schedule of Capitalized Interest Costs) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Interest [Abstract]
Interest capitalized beginning of period	$ 57,509	$ 70,837	$ 60,838	$ 67,069
Interest capitalized during period	15,058	18,168	30,106	35,621
Less: capitalized interest in cost of sales	(18,406)	(18,694)	(36,783)	(32,379)
Interest capitalized end of period	$ 54,161	$ 70,311	$ 54,161	$ 70,311