SUMMARIZED CONDENSED CONSOLIDATING INFORMATION - Condensed Consolidating Statement of Cash Flows (unaudited) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 94,494	$ 51,307
Cash flows from investing activities:
Acquisitions of real estate	0	(301,851)
Origination and fundings of loans receivable	(6,283)	(21,737)
Origination and fundings of preferred equity investments	(6,172)	(5,131)
Additions to real estate	(874)	(1,033)
Release of contingent consideration held in escrow	0	5,240
Repayment of loans receivable	193,893	2,052
Investment in subsidiary	0	0
Net proceeds from the sale of real estate	75,456	1,800
Distribution from subsidiary	0	0
Intercompany financing	0	0
Net cash provided by (used in) investing activities	256,020	(320,660)
Cash flows from financing activities:
Net repayments from revolving credit facility	(255,000)	54,000
Proceeds from term loans	69,360	73,242
Principal payments on mortgage notes	(2,060)	(1,340)
Payments of deferred financing costs	(5,931)	(834)
Issuance of common stock, net	(1,289)	140,062
Dividends paid on common and preferred stock	(59,288)	(51,343)
Contribution from parent	0	0
Distribution to parent	0	0
Intercompany financing	0	0
Net cash provided by (used in) financing activities	(254,208)	213,787
Net increase (decrease) in cash and cash equivalents	96,306	(55,566)
Effect of foreign currency translation on cash and cash equivalents	128	(185)
Cash and cash equivalents, beginning of period	7,434	61,793
Cash and cash equivalents, end of period	103,868	6,042
Elimination [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
Cash flows from investing activities:
Acquisitions of real estate		0
Origination and fundings of loans receivable	0	0
Origination and fundings of preferred equity investments	0	0
Additions to real estate	0	0
Release of contingent consideration held in escrow		0
Repayment of loans receivable	0	0
Investment in subsidiary	400	828
Net proceeds from the sale of real estate	0	0
Distribution from subsidiary	(4,050)	(2,710)
Intercompany financing	(344,836)	419,504
Net cash provided by (used in) investing activities	(348,486)	417,622
Cash flows from financing activities:
Net repayments from revolving credit facility	0	0
Proceeds from term loans	0	0
Principal payments on mortgage notes	0	0
Payments of deferred financing costs	0	0
Issuance of common stock, net	0	0
Dividends paid on common and preferred stock	0	0
Contribution from parent	(400)	(828)
Distribution to parent	4,050	2,710
Intercompany financing	344,836	(419,504)
Net cash provided by (used in) financing activities	348,486	(417,622)
Net increase (decrease) in cash and cash equivalents	0	0
Effect of foreign currency translation on cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	87,170	37,007
Cash flows from investing activities:
Acquisitions of real estate		0
Origination and fundings of loans receivable	0	0
Origination and fundings of preferred equity investments	0	0
Additions to real estate	(120)	(11)
Release of contingent consideration held in escrow		0
Repayment of loans receivable	0	0
Investment in subsidiary	(200)	(414)
Net proceeds from the sale of real estate	0	0
Distribution from subsidiary	2,025	1,355
Intercompany financing	64,758	(182,815)
Net cash provided by (used in) investing activities	66,463	(181,885)
Cash flows from financing activities:
Net repayments from revolving credit facility	0	0
Proceeds from term loans	0	0
Principal payments on mortgage notes	0	0
Payments of deferred financing costs	0	0
Issuance of common stock, net	(1,289)	140,062
Dividends paid on common and preferred stock	(59,288)	(51,343)
Contribution from parent	0	0
Distribution to parent	0	0
Intercompany financing	0	0
Net cash provided by (used in) financing activities	(60,577)	88,719
Net increase (decrease) in cash and cash equivalents	93,056	(56,159)
Effect of foreign currency translation on cash and cash equivalents	0	(185)
Cash and cash equivalents, beginning of period	2,548	58,799
Cash and cash equivalents, end of period	95,604	2,455
Issuers [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
Cash flows from investing activities:
Acquisitions of real estate		0
Origination and fundings of loans receivable	0	0
Origination and fundings of preferred equity investments	0	0
Additions to real estate	0	0
Release of contingent consideration held in escrow		0
Repayment of loans receivable	0	0
Investment in subsidiary	(200)	(414)
Net proceeds from the sale of real estate	0	0
Distribution from subsidiary	2,025	1,355
Intercompany financing	280,078	(236,689)
Net cash provided by (used in) investing activities	281,903	(235,748)
Cash flows from financing activities:
Net repayments from revolving credit facility	(255,000)	54,000
Proceeds from term loans	45,000	0
Principal payments on mortgage notes	0	0
Payments of deferred financing costs	(5,320)	(126)
Issuance of common stock, net	0	0
Dividends paid on common and preferred stock	0	0
Contribution from parent	200	414
Distribution to parent	(2,025)	(1,355)
Intercompany financing	(64,758)	182,815
Net cash provided by (used in) financing activities	(281,903)	235,748
Net increase (decrease) in cash and cash equivalents	0	0
Effect of foreign currency translation on cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	0	0
Combined Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	608	0
Cash flows from investing activities:
Acquisitions of real estate		(290,604)
Origination and fundings of loans receivable	(6,283)	(21,737)
Origination and fundings of preferred equity investments	(6,172)	(5,131)
Additions to real estate	(400)	(851)
Release of contingent consideration held in escrow		5,240
Repayment of loans receivable	193,893	2,052
Investment in subsidiary	0	0
Net proceeds from the sale of real estate	75,456	1,800
Distribution from subsidiary	0	0
Intercompany financing	0	0
Net cash provided by (used in) investing activities	256,494	(309,231)
Cash flows from financing activities:
Net repayments from revolving credit facility	0	0
Proceeds from term loans	24,360	73,242
Principal payments on mortgage notes	0	0
Payments of deferred financing costs	(611)	(700)
Issuance of common stock, net	0	0
Dividends paid on common and preferred stock	0	0
Contribution from parent	0	0
Distribution to parent	0	0
Intercompany financing	(280,078)	236,689
Net cash provided by (used in) financing activities	(256,329)	309,231
Net increase (decrease) in cash and cash equivalents	773	0
Effect of foreign currency translation on cash and cash equivalents	109	0
Cash and cash equivalents, beginning of period	1,008	0
Cash and cash equivalents, end of period	1,890	0
Combined Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	6,716	14,300
Cash flows from investing activities:
Acquisitions of real estate		(11,247)
Origination and fundings of loans receivable	0	0
Origination and fundings of preferred equity investments	0	0
Additions to real estate	(354)	(171)
Release of contingent consideration held in escrow		0
Repayment of loans receivable	0	0
Investment in subsidiary	0	0
Net proceeds from the sale of real estate	0	0
Distribution from subsidiary	0	0
Intercompany financing	0	0
Net cash provided by (used in) investing activities	(354)	(11,418)
Cash flows from financing activities:
Net repayments from revolving credit facility	0	0
Proceeds from term loans	0	0
Principal payments on mortgage notes	(2,060)	(1,340)
Payments of deferred financing costs	0	(8)
Issuance of common stock, net	0	0
Dividends paid on common and preferred stock	0	0
Contribution from parent	200	414
Distribution to parent	(2,025)	(1,355)
Intercompany financing	0	0
Net cash provided by (used in) financing activities	(3,885)	(2,289)
Net increase (decrease) in cash and cash equivalents	2,477	593
Effect of foreign currency translation on cash and cash equivalents	19	0
Cash and cash equivalents, beginning of period	3,878	2,994
Cash and cash equivalents, end of period	$ 6,374	$ 3,587