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SHARE-BASED COMPENSATION - Share-based Compensation Expense (Details) - General and Administrative Expense - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total Share-based compensation expense	$ 9,741	$ 7,137	$ 5,433
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total Share-based compensation expense	2,051	1,961	1,314
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total Share-based compensation expense	2,778	2,569	2,437
LTIP Units
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total Share-based compensation expense	2,218	557	473
OPP Units
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total Share-based compensation expense	2,530	2,050	1,209
DSUs
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Total Share-based compensation expense	$ 164	$ 0	$ 0

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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+ References

No definition available.

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