REAL ESTATE AND RELATED LEASE INTANGIBLES, NET - Unaudited Pro Forma (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Operating lease income									$ 80,465	$ 56,649	$ 37,395
Net income	$ 56,676	$ 2,798	$ 68,697	$ 17,963	$ 11,806	$ 37,176	$ 30,243	$ 18,401	146,134	97,626	188,733
Net loss attributable to noncontrolling interest in consolidated joint ventures									(1,568)	370	1,098
Net (income) loss attributable to predecessor unitholders					0	0	0	12,628	0	12,628	189,831
Net (income) loss attributable to noncontrolling interest in operating partnership	(27,407)	430	(35,171)	(8,597)	(7,350)	(22,827)	(17,691)	(18,568)	(70,745)	(66,437)	189,831
Net income attributable to Class A common shareholders	$ 27,123	$ 3,313	$ 34,210	$ 9,175	$ 4,374	14,656	$ 12,505	$ 12,652	73,821	44,187
Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Operating lease income									6,411	34,446	34,185
Net income									3,620	10,518	4,881
Net loss attributable to noncontrolling interest in consolidated joint ventures									0	257	(107)
Net (income) loss attributable to predecessor unitholders										0
Net (income) loss attributable to noncontrolling interest in operating partnership									(1,694)	(5,163)	95
Net income attributable to Class A common shareholders									1,926	5,612
Consolidated Pro Forma
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Operating lease income									86,876	91,095	71,580
Net income									149,754	108,144	193,614
Net loss attributable to noncontrolling interest in consolidated joint ventures									(1,568)	627	991
Net (income) loss attributable to predecessor unitholders										12,628
Net (income) loss attributable to noncontrolling interest in operating partnership									(72,439)	(71,600)	189,926
Net income attributable to Class A common shareholders									75,747	49,799
2015 Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue recorded from acquisitions included in operating lease income									$ 8,100
2014 Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue recorded from acquisitions included in operating lease income						$ 7,300				$ 900
2013 Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue recorded from acquisitions included in operating lease income											$ 16,800