REAL ESTATE AND RELATED LEASE INTANGIBLES, NET - Unaudited Pro Forma (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Operating lease income									$ 77,277	$ 80,465	$ 56,649
Net income	$ 71,621	$ 49,598	$ 3,945	$ (11,444)	$ 56,676	$ 2,798	$ 68,697	$ 17,963	113,720	146,134	97,626
Net loss attributable to noncontrolling interest in consolidated joint ventures									138	(1,568)	370
Pre-IPO net loss attributable to predecessor unitholders									0	0	12,628
Net (income) loss attributable to noncontrolling interest in operating partnership	(29,467)	(22,429)	(908)	5,673	(27,407)	430	(35,171)	(8,597)	(47,131)	(70,745)	(66,437)
Net income attributable to Class A common shareholders	$ 41,856	$ 27,608	$ 2,802	$ (5,539)	$ 27,123	$ 3,313	$ 34,210	$ 9,175	66,727	73,821	44,187
2016 Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue recorded from acquisitions									2,800
Earnings (losses) recorded from acquisitions									(300)
2015 Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue recorded from acquisitions										14,000
Earnings (losses) recorded from acquisitions										3,200
2014 Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Revenue recorded from acquisitions											7,300
Earnings (losses) recorded from acquisitions											(1,600)
Acquisitions
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Operating lease income									2,473	10,966	34,446
Net income									2,080	7,363	10,518
Net loss attributable to noncontrolling interest in consolidated joint ventures									0	0	257
Pre-IPO net loss attributable to predecessor unitholders											0
Net (income) loss attributable to noncontrolling interest in operating partnership									(865)	(3,334)	(4,922)
Net income attributable to Class A common shareholders									1,215	4,029	5,852
Consolidated Pro Forma
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Operating lease income									79,750	91,431	91,095
Net income									115,800	153,497	108,144
Net loss attributable to noncontrolling interest in consolidated joint ventures									138	(1,568)	627
Pre-IPO net loss attributable to predecessor unitholders											12,628
Net (income) loss attributable to noncontrolling interest in operating partnership									(47,996)	(74,079)	(71,359)
Net income attributable to Class A common shareholders									$ 67,942	$ 77,850	$ 50,039