Schedule III - Real Estate and Accumulated Depreciation (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Real Estate Properties [Line Items]
Balance at January 1	$ 1,452,759	$ 1,029,214	$ 556,820
Construction and acquisition cost	349,909	701,262	508,218
Disposition of real estate	0	(277,717)	(35,824)
Balance at December 31	$ 1,802,668	$ 1,452,759	$ 1,029,214