SUMMARIZED CONDENSED CONSOLIDATING INFORMATION - Condensed Consolidating Statement of Cash Flows (unaudited) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 31,438	$ 24,726
Cash flows from investing activities:
Fundings of loans receivable	(508)	(5,850)
Origination and fundings of preferred equity investments	(51)	(984)
Additions to real estate	(520)	(474)
Repayment of loans receivable	118	8,874
Investment in subsidiary		0
Net proceeds from the sale of real estate	0	398
Distribution from subsidiary	0	0
Intercompany financing	0	0
Net cash (used in) provided by investing activities	(961)	1,964
Cash flows from financing activities:
Net repayments from revolving credit facility	(9,000)	(57,000)
Proceeds from term loans	0	69,360
Principal payments on mortgage notes	(1,021)	(1,022)
Payments of deferred financing costs	(109)	(5,885)
Issuance of common stock	(3,224)	(1,274)
Dividends paid on common and preferred stock	(29,993)	(29,301)
Contribution from parent		0
Distribution to parent	0	0
Intercompany financing	0	0
Net cash used in financing activities	(43,347)	(25,122)
Net (decrease) increase in cash and cash equivalents	(12,870)	1,568
Effect of foreign currency translation on cash and cash equivalents	21	131
Cash and cash equivalents, beginning of period	25,663	7,434
Cash and cash equivalents, end of period	12,814	9,133
Elimination [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
Cash flows from investing activities:
Fundings of loans receivable	0	0
Origination and fundings of preferred equity investments	0	0
Additions to real estate	0	0
Repayment of loans receivable	0	0
Investment in subsidiary		400
Net proceeds from the sale of real estate		0
Distribution from subsidiary	(4,948)	(4,050)
Intercompany financing	10,941	(33,968)
Net cash (used in) provided by investing activities	5,993	(37,618)
Cash flows from financing activities:
Net repayments from revolving credit facility	0	0
Proceeds from term loans		0
Principal payments on mortgage notes	0	0
Payments of deferred financing costs	0	0
Issuance of common stock	0	0
Dividends paid on common and preferred stock	0	0
Contribution from parent		(400)
Distribution to parent	4,948	4,050
Intercompany financing	(10,941)	33,968
Net cash used in financing activities	(5,993)	37,618
Net (decrease) increase 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	27,886	21,718
Cash flows from investing activities:
Fundings of loans receivable	0	0
Origination and fundings of preferred equity investments	0	0
Additions to real estate	(1)	(74)
Repayment of loans receivable	0	0
Investment in subsidiary		(200)
Net proceeds from the sale of real estate		0
Distribution from subsidiary	2,474	2,025
Intercompany financing	(10,025)	8,347
Net cash (used in) provided by investing activities	(7,552)	10,098
Cash flows from financing activities:
Net repayments from revolving credit facility	0	0
Proceeds from term loans		0
Principal payments on mortgage notes	0	0
Payments of deferred financing costs	0	0
Issuance of common stock	(3,224)	(1,274)
Dividends paid on common and preferred stock	(29,993)	(29,301)
Contribution from parent		0
Distribution to parent	0	0
Intercompany financing	0	0
Net cash used in financing activities	(33,217)	(30,575)
Net (decrease) increase in cash and cash equivalents	(12,883)	1,241
Effect of foreign currency translation on cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	18,168	2,548
Cash and cash equivalents, end of period	5,285	3,789
Issuers [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	0	0
Cash flows from investing activities:
Fundings of loans receivable	0	0
Origination and fundings of preferred equity investments	0	0
Additions to real estate	0	0
Repayment of loans receivable	0	0
Investment in subsidiary		(200)
Net proceeds from the sale of real estate		0
Distribution from subsidiary	2,474	2,025
Intercompany financing	(916)	25,621
Net cash (used in) provided by investing activities	1,558	27,446
Cash flows from financing activities:
Net repayments from revolving credit facility	(9,000)	(57,000)
Proceeds from term loans		45,000
Principal payments on mortgage notes	0	0
Payments of deferred financing costs	(109)	(5,274)
Issuance of common stock	0	0
Dividends paid on common and preferred stock	0	0
Contribution from parent		200
Distribution to parent	(2,474)	(2,025)
Intercompany financing	10,025	(8,347)
Net cash used in financing activities	(1,558)	(27,446)
Net (decrease) increase 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	1,017	1,430
Cash flows from investing activities:
Fundings of loans receivable	(508)	(5,850)
Origination and fundings of preferred equity investments	(51)	(984)
Additions to real estate	(474)	(400)
Repayment of loans receivable	118	8,874
Investment in subsidiary		0
Net proceeds from the sale of real estate		398
Distribution from subsidiary	0	0
Intercompany financing	0	0
Net cash (used in) provided by investing activities	(915)	2,038
Cash flows from financing activities:
Net repayments from revolving credit facility	0	0
Proceeds from term loans		24,360
Principal payments on mortgage notes	0	(38)
Payments of deferred financing costs	0	(611)
Issuance of common stock	0	0
Dividends paid on common and preferred stock	0	0
Contribution from parent		0
Distribution to parent	0	0
Intercompany financing	916	(25,621)
Net cash used in financing activities	916	(1,910)
Net (decrease) increase in cash and cash equivalents	1,018	1,558
Effect of foreign currency translation on cash and cash equivalents	14	70
Cash and cash equivalents, beginning of period	2,675	456
Cash and cash equivalents, end of period	3,707	2,084
Combined Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	2,535	1,578
Cash flows from investing activities:
Fundings of loans receivable	0	0
Origination and fundings of preferred equity investments	0	0
Additions to real estate	(45)	0
Repayment of loans receivable	0	0
Investment in subsidiary		0
Net proceeds from the sale of real estate		0
Distribution from subsidiary	0	0
Intercompany financing	0	0
Net cash (used in) provided by investing activities	(45)	0
Cash flows from financing activities:
Net repayments from revolving credit facility	0	0
Proceeds from term loans		0
Principal payments on mortgage notes	(1,021)	(984)
Payments of deferred financing costs	0	0
Issuance of common stock	0	0
Dividends paid on common and preferred stock	0	0
Contribution from parent		200
Distribution to parent	(2,474)	(2,025)
Intercompany financing	0	0
Net cash used in financing activities	(3,495)	(2,809)
Net (decrease) increase in cash and cash equivalents	(1,005)	(1,231)
Effect of foreign currency translation on cash and cash equivalents	7	61
Cash and cash equivalents, beginning of period	4,820	4,430
Cash and cash equivalents, end of period	$ 3,822	$ 3,260