Schedule III - Real Estate and Accumulated Depreciation (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Balance at January 1	$ 55,177	$ 42,137	$ 23,437
Current year depreciation expense	53,734	35,538	23,580
Disposition of real estate	0	(22,498)	(4,880)
Balance at December 31	$ 108,911	$ 55,177	$ 42,137