SUMMARIZED CONSOLIDATING INFORMATION - Schedule of Consolidating Statement of Cash Flows (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 30, 2015	Mar. 21, 2013	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities			$ 176,739	$ 121,101	$ 85,337
Cash flows from investing activities:
Acquisitions of real estate			(153,579)	(461,330)	(771,479)
Origination and fundings of loans receivable			(9,675)	(49,687)	(66,397)
Origination and fundings of preferred equity investments			(7,348)	(12,804)	(15,486)
Additions to real estate			(1,003)	(3,689)	(1,471)
Repayment of loans receivable			215,962	5,803	1,097
Investment in Subsidiary			0	0	0
Net proceeds from sale of real estate			98,006	27,241	27,264
Distribution from Subsidiary			0	0	0
Intercompany financing			0	0	0
Release of contingent consideration held in escrow			0	5,240	0
Net cash (used in) provided by investing activities			142,363	(489,226)	(826,472)
Cash flows from financing activities:
Proceeds from issuance of senior unsecured notes			0	0	499,250
Principal payments on senior unsecured notes			0	0	(211,250)
Net proceeds (repayment) from revolving credit facility			(229,000)	187,000	132,500
Proceeds from term loan			69,360	73,242	0
Proceeds from mortgage notes			0	28,735	57,703
Principal payments on mortgage notes			(14,768)	(3,132)	(89,110)
Payments of deferred financing costs			(5,937)	(1,452)	(19,131)
Contributions by noncontrolling interests			0	179	0
Issuance of preferred stock		$ 138,300
Issuance of common stock, net	$ 147,900		(1,289)	139,403	510,147
Dividends paid on common and preferred stock			(119,264)	(109,897)	(81,489)
Contribution from Parent			0	0	0
Distribution to Parent			0	0	0
Intercompany financing			0	0	0
Net cash provided by (in used) financing activities			(300,898)	314,078	798,620
Net increase (decrease) in cash and cash equivalents			18,204	(54,047)	57,485
Effect of foreign currency translation on cash and cash equivalents			25	(312)	0
Cash and cash equivalents, beginning of period			7,434	61,793	4,308
Cash and cash equivalents, end of period			25,663	7,434	61,793
Elimination [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities			0	0	0
Cash flows from investing activities:
Acquisitions of real estate			0	0	0
Origination and fundings of loans receivable			0	0	0
Origination and fundings of preferred equity investments			0	0	0
Additions to real estate			0	0	0
Repayment of loans receivable			0	0	0
Investment in Subsidiary			400	828	24,294
Net proceeds from sale of real estate			0	0	0
Distribution from Subsidiary			(12,808)	(7,030)	(2,492)
Intercompany financing			(142,358)	588,536	1,374,760
Release of contingent consideration held in escrow				0
Net cash (used in) provided by investing activities			(154,766)	582,334	1,396,562
Cash flows from financing activities:
Proceeds from issuance of senior unsecured notes					0
Principal payments on senior unsecured notes					0
Net proceeds (repayment) from revolving credit facility			0	0	0
Proceeds from term loan			0	0
Proceeds from mortgage notes				0	0
Principal payments on mortgage notes			0	0	0
Payments of deferred financing costs			0	0	0
Contributions by noncontrolling interests				0
Issuance of common stock, net			0	0	0
Dividends paid on common and preferred stock			0	0	0
Contribution from Parent			(400)	(828)	(24,294)
Distribution to Parent			12,808	7,030	2,492
Intercompany financing			142,358	(588,536)	(1,374,760)
Net cash provided by (in used) financing activities			154,766	(582,334)	(1,396,562)
Net increase (decrease) in cash and cash equivalents			0	0	0
Effect of foreign currency translation on cash and cash equivalents			0	0
Cash and cash equivalents, beginning of period			0	0	0
Cash and cash equivalents, end of period			0	0	0
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities			153,577	112,291	53,292
Cash flows from investing activities:
Acquisitions of real estate			0	0	0
Origination and fundings of loans receivable			0	0	0
Origination and fundings of preferred equity investments			0	0	0
Additions to real estate			(124)	(34)	(11)
Repayment of loans receivable			0	0	0
Investment in Subsidiary			(200)	(414)	(12,147)
Net proceeds from sale of real estate			0	0	0
Distribution from Subsidiary			6,404	3,515	1,246
Intercompany financing			(23,484)	(200,884)	(415,790)
Release of contingent consideration held in escrow				0
Net cash (used in) provided by investing activities			(17,404)	(197,817)	(426,702)
Cash flows from financing activities:
Proceeds from issuance of senior unsecured notes					0
Principal payments on senior unsecured notes					0
Net proceeds (repayment) from revolving credit facility			0	0	0
Proceeds from term loan			0	0
Proceeds from mortgage notes				0	0
Principal payments on mortgage notes			0	0	0
Payments of deferred financing costs			0	0	0
Contributions by noncontrolling interests				0
Issuance of common stock, net			(1,289)	139,403	510,147
Dividends paid on common and preferred stock			(119,264)	(109,897)	(81,489)
Contribution from Parent			0	0	0
Distribution to Parent			0	0	0
Intercompany financing			0	0	0
Net cash provided by (in used) financing activities			(120,553)	29,506	428,658
Net increase (decrease) in cash and cash equivalents			15,620	(56,020)	55,248
Effect of foreign currency translation on cash and cash equivalents			0	(231)
Cash and cash equivalents, beginning of period			2,548	58,799	3,551
Cash and cash equivalents, end of period			18,168	2,548	58,799
Issuers [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities			0	0	0
Cash flows from investing activities:
Acquisitions of real estate			0	0	0
Origination and fundings of loans receivable			0	0	0
Origination and fundings of preferred equity investments			0	0	0
Additions to real estate			0	0	0
Repayment of loans receivable			0	0	0
Investment in Subsidiary			(200)	(414)	(12,147)
Net proceeds from sale of real estate			0	0	0
Distribution from Subsidiary			6,404	3,515	1,246
Intercompany financing			165,842	(387,652)	(958,970)
Release of contingent consideration held in escrow				0
Net cash (used in) provided by investing activities			172,046	(384,551)	(969,871)
Cash flows from financing activities:
Proceeds from issuance of senior unsecured notes					499,250
Principal payments on senior unsecured notes					(211,250)
Net proceeds (repayment) from revolving credit facility			(229,000)	187,000	268,000
Proceeds from term loan			45,000	0
Proceeds from mortgage notes				0	0
Principal payments on mortgage notes			0	0	0
Payments of deferred financing costs			(5,326)	(232)	(12,820)
Contributions by noncontrolling interests				0
Issuance of common stock, net			0	0	0
Dividends paid on common and preferred stock			0	0	0
Contribution from Parent			200	414	12,147
Distribution to Parent			(6,404)	(3,515)	(1,246)
Intercompany financing			23,484	200,884	415,790
Net cash provided by (in used) financing activities			(172,046)	384,551	969,871
Net increase (decrease) in cash and cash equivalents			0	0	0
Effect of foreign currency translation on cash and cash equivalents			0	0
Cash and cash equivalents, beginning of period			0	0	0
Cash and cash equivalents, end of period			0	0	0
Combined Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities			12,074	820	0
Cash flows from investing activities:
Acquisitions of real estate			(133,797)	(450,082)	(763,378)
Origination and fundings of loans receivable			(9,675)	(49,687)	(66,397)
Origination and fundings of preferred equity investments			(7,348)	(12,804)	(15,486)
Additions to real estate			(502)	(1,286)	(1,437)
Repayment of loans receivable			215,962	5,803	1,097
Investment in Subsidiary			0	0	0
Net proceeds from sale of real estate			97,407	27,241	27,264
Distribution from Subsidiary			0	0	0
Intercompany financing			0	0	0
Release of contingent consideration held in escrow				5,240
Net cash (used in) provided by investing activities			162,047	(475,575)	(818,337)
Cash flows from financing activities:
Proceeds from issuance of senior unsecured notes					0
Principal payments on senior unsecured notes					0
Net proceeds (repayment) from revolving credit facility			0	0	(135,500)
Proceeds from term loan			24,360	73,242
Proceeds from mortgage notes				0	0
Principal payments on mortgage notes			(10,766)	0	0
Payments of deferred financing costs			(611)	(740)	(5,133)
Contributions by noncontrolling interests				0
Issuance of common stock, net			0	0	0
Dividends paid on common and preferred stock			0	0	0
Contribution from Parent			0	0	0
Distribution to Parent			0	0	0
Intercompany financing			(184,957)	402,745	958,970
Net cash provided by (in used) financing activities			(171,974)	475,247	818,337
Net increase (decrease) in cash and cash equivalents			2,147	492	0
Effect of foreign currency translation on cash and cash equivalents			72	(36)
Cash and cash equivalents, beginning of period			456	0	0
Cash and cash equivalents, end of period			2,675	456	0
Combined Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities			11,088	7,990	32,045
Cash flows from investing activities:
Acquisitions of real estate			(19,782)	(11,248)	(8,101)
Origination and fundings of loans receivable			0	0	0
Origination and fundings of preferred equity investments			0	0	0
Additions to real estate			(377)	(2,369)	(23)
Repayment of loans receivable			0	0	0
Investment in Subsidiary			0	0	0
Net proceeds from sale of real estate			599	0	0
Distribution from Subsidiary			0	0	0
Intercompany financing			0	0	0
Release of contingent consideration held in escrow				0
Net cash (used in) provided by investing activities			(19,560)	(13,617)	(8,124)
Cash flows from financing activities:
Proceeds from issuance of senior unsecured notes					0
Principal payments on senior unsecured notes					0
Net proceeds (repayment) from revolving credit facility			0	0	0
Proceeds from term loan			0	0
Proceeds from mortgage notes				28,735	57,703
Principal payments on mortgage notes			(4,002)	(3,132)	(89,110)
Payments of deferred financing costs			0	(480)	(1,178)
Contributions by noncontrolling interests				179
Issuance of common stock, net			0	0	0
Dividends paid on common and preferred stock			0	0	0
Contribution from Parent			200	414	12,147
Distribution to Parent			(6,404)	(3,515)	(1,246)
Intercompany financing			19,115	(15,093)	0
Net cash provided by (in used) financing activities			8,909	7,108	(21,684)
Net increase (decrease) in cash and cash equivalents			437	1,481	2,237
Effect of foreign currency translation on cash and cash equivalents			(47)	(45)
Cash and cash equivalents, beginning of period			4,430	2,994	757
Cash and cash equivalents, end of period			$ 4,820	$ 4,430	$ 2,994