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STORAGE PROPERTIES - Summary (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
STORAGE FACILITIES |  |
Storage facilities | $ 4,161,715 | $ 3,998,180
Less: Accumulated depreciation | (752,925) | (671,364)
Storage facilities, net (including VIE assets of $291,496 and $208,048, respectively) | 3,408,790 | 3,326,816
Land |  |
STORAGE FACILITIES |  |
Storage facilities | 711,140 | 649,744
Buildings and improvements |  |
STORAGE FACILITIES |  |
Storage facilities | 3,086,252 | 2,928,275
Equipment |  |
STORAGE FACILITIES |  |
Storage facilities | 182,958 | 217,867
Construction in progress |  |
STORAGE FACILITIES |  |
Storage facilities | $ 181,365 | $ 202,294

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- Definition The cumulative amount of depreciation for real estate property held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(3)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investment property which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of real estate investment property, net of accumulated depreciation, which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(d)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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