ACCOUNTING POLICIES - Accounting for Historic and New Markets Tax Credits (Details)	Sep. 30, 2017 property
Business Acquisition [Line Items]
Number of real estate properties	1,200
Maximum of qualified investment potentially received as new market tax credit	39.00%
Amount of recapture per year historic tax credits are subject to one year after completion of project	20.00%
Amount of recapture new market tax credits are subject to until the end of the seventh year following the qualified investment	100.00%
Wexford Acquisition
Business Acquisition [Line Items]
Number of real estate properties	11
Development Assets \| Wexford Acquisition
Business Acquisition [Line Items]
Number of real estate properties	3

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The number of real estate properties owned as of the balance sheet date.

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Amount of recapture new market tax credits are subject to until the end of the seventh year following the qualified investment

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Amount of recapture per year historic tax credits are subject to one year after completion of project

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Maximum of qualified investment potentially received as new market tax credit

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