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COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
COMMITMENTS AND CONTINGENCIES |  |  |
Ground rent expense | $ 3,400 | $ 2,700 | $ 2,400
Total future minimum rental payments under non-cancelable ground leases |  |  |
2018 | 2,500 |  |
2019 | 2,670 |  |
2020 | 2,743 |  |
2021 | 2,812 |  |
2022 | 2,971 |  |
2023 and thereafter | 119,343 |  |
Total | 133,039 |  |
Future milestone payments payable | $ 82,700 |  |
Self-storage facilities subject to ground lease |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |
Number of operating self-storage facilities subject to a ground lease | property | 8 |  |
Number of self-storage facilities under development subject to a ground lease | property | 2 |  |
Land |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |
Number of operating self-storage facilities subject to a ground lease | property | 2 |  |

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- Definition Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
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