Notes Payable (Other Debt Information) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 14, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Notes payable	$ 1,837,449		$ 1,837,449			$ 1,062,570
Notes payable, fair value	1,900,000		1,900,000			$ 1,100,000
Total interest incurred	13,175	$ 11,103	25,010	$ 21,977
Interest capitalized	(1,116)	(1,389)	(2,131)	(2,485)
Total interest expense	$ 12,059	$ 9,714	$ 22,879	$ 19,492
Mortgage Loan
Debt Instrument [Line Items]
Notes payable					$ 66,000
Interest rate (percent)					4.24%
Notes payable					$ 68,500