SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
SEC Schedule III, Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]
Balance as of the beginning of the year	$ 729,034	$ 224,730	$ 111,149
Acquisitions	695,693	505,379	113,225
Additions	4,440	900	806
Impairment	0	(1,750)	0
Dispositions	(4,273)	(225)	(450)
Balance as of the end of the year	1,424,894	729,034	224,730
SEC Schedule III, Reconciliation of Real Estate Accumulated Depreciation [Roll Forward]
Balance as of the beginning of the year	32,772	20,299	16,495
Acquisitions	9,512	6,575	694
Additions	20,446	5,898	3,110
Dispositions	(1,488)	0	0
Balance as of the end of the year	$ 61,242	$ 32,772	$ 20,299