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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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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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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Details) - Acquisitions $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) unit	Sep. 30, 2018 USD ($) unit	Sep. 30, 2019 USD ($) unit	Sep. 30, 2018 USD ($) unit
Acquisitions and development projects placed in service [Abstract]
Acquisition costs	$ 125,300	$ 0	$ 171,362	$ 128,700
Form of consideration, cash			154,802
Form of consideration, units			16,560
Investment allocation, land	13,316	25,525	13,316	25,525
Investment allocation, building	154,796	102,101	154,796	102,101
Investment allocation, intangible assets	2,825	$ 1,074	2,825	$ 1,074
Multi-Family Residential
Acquisitions and development projects placed in service [Abstract]
Acquisition costs			169,250
Form of consideration, cash			152,690
Form of consideration, units			16,560
Investment allocation, land	13,070		13,070
Investment allocation, building	152,930		152,930
Investment allocation, intangible assets	$ 2,825		$ 2,825
Multi-Family Residential \| 272 homes - SouthFork Townhomes - Lakeville, MN
Acquisitions and development projects placed in service [Abstract]
Number of homes \| unit	272		272
Acquisition costs			$ 44,000
Form of consideration, cash			27,440
Form of consideration, units			16,560
Investment allocation, land	$ 3,502		3,502
Investment allocation, building	39,950		39,950
Investment allocation, intangible assets	$ 548		$ 548
Multi-Family Residential \| 96 homes - FreightYard Townhomes and Flats - Minneapolis, MN
Acquisitions and development projects placed in service [Abstract]
Number of homes \| unit	96,000		96,000
Acquisition costs			$ 26,000
Form of consideration, cash			26,000
Form of consideration, units			0
Investment allocation, land	$ 1,889		1,889
Investment allocation, building	23,615		23,615
Investment allocation, intangible assets	$ 496		$ 496
Multi-Family Residential \| 328 homes - Lugano at Cherry Creek - Denver, CO(3)
Acquisitions and development projects placed in service [Abstract]
Number of homes \| unit	328,000		328,000
Acquisition costs			$ 99,250
Form of consideration, cash			99,250
Form of consideration, units			0
Investment allocation, land	$ 7,679		7,679
Investment allocation, building	89,365		89,365
Investment allocation, intangible assets	1,781		1,781
Multi-Family Residential \| 390 homes - Westend - Denver, CO
Acquisitions and development projects placed in service [Abstract]
Number of homes \| unit		390		390
Acquisition costs				$ 128,700
Investment allocation, land		$ 25,525		25,525
Investment allocation, building		102,101		102,101
Investment allocation, intangible assets		$ 1,074		$ 1,074
Commercial Property \| Minot 3100 10th St SW - Minot, ND
Acquisitions and development projects placed in service [Abstract]
Acquisition costs			2,112
Form of consideration, cash			2,112
Form of consideration, units			0
Investment allocation, land	246		246
Investment allocation, building	1,866		1,866
Investment allocation, intangible assets	$ 0		$ 0