Notes Payable - (Other Debt Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Debt Disclosure [Abstract]
Notes payable, fair value	$ 2,000,000		$ 2,000,000		$ 2,300,000
Total interest incurred	17,952	$ 13,175	39,165	$ 25,010
Interest capitalized	(3,959)	(1,116)	(9,268)	(2,131)
Total interest expense	$ 13,993	$ 12,059	$ 29,897	$ 22,879