Notes Payable - (Other Debt Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Debt Disclosure [Abstract]
Notes payable, fair value	$ 2,100,000		$ 2,100,000		$ 2,300,000
Total interest incurred	17,780	$ 18,918	56,944	$ 43,928
Interest capitalized	(2,722)	(4,218)	(11,989)	(6,349)
Total interest expense	$ 15,058	$ 14,700	$ 44,955	$ 37,579