ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) - Acquisitions $ in Thousands	3 Months Ended
Mar. 31, 2019 USD ($) unit	Mar. 31, 2018 USD ($) unit
Acquisitions and development projects placed in service [Abstract]
Acquisition costs	$ 44,000	$ 128,700
Form of consideration, cash	27,440
Form of consideration, units	16,560
Investment allocation, land	3,502	25,525
Investment allocation, building	39,950	102,101
Investment allocation, intangible assets	$ 548	$ 1,074
Multi-Family Residential \| 272 homes - SouthFork Townhomes- Lakeville, MN
Acquisitions and development projects placed in service [Abstract]
Number of homes \| unit	272
Acquisition costs	$ 44,000
Form of consideration, cash	27,440
Form of consideration, units	16,560
Investment allocation, land	3,502
Investment allocation, building	39,950
Investment allocation, intangible assets	$ 548
Multi-Family Residential \| 390 homes - Westend - Denver, CO
Acquisitions and development projects placed in service [Abstract]
Number of homes \| unit		390
Acquisition costs		$ 128,700
Investment allocation, land		25,525
Investment allocation, building		102,101
Investment allocation, intangible assets		$ 1,074

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount of real estate acquired, at the acquisition date.

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The number of units in a real estate property owned as of the balance sheet date.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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