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NONCONTROLLING INTERESTS - Interests in Consolidated Real Estate Joint Ventures (Details) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 16, 2021 USD ($) | Mar. 31, 2021 facility | Jun. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) facility | Dec. 31, 2020 USD ($)
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |
Assets |  |  | $ 4,771,232 | $ 4,771,232 | $ 4,778,142
Total assets |  |  | 4,771,232 | 4,771,232 | 4,778,142
Liabilities |  |  | 2,573,782 | 2,573,782 | 2,687,880
Total liabilities |  |  | 2,573,782 | 2,573,782 | 2,687,880
Noncontrolling interests in subsidiaries |  |  | 13,509 | $ 13,509 | $ 8,632
Reduction to additional paid in capital |  |  | 5,104 |  |
VIE |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 6 |
Assets |  |  | 132,714 | $ 132,714 |
Total assets |  |  | 132,714 | 132,714 |
Liabilities |  |  | 51,539 | 51,539 |
Total liabilities |  |  | 51,539 | $ 51,539 |
CS Vienna LLC | VIE |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |
Ownership interest held by the entity (as a percent) |  |  |  | 72.00% |
Assets |  |  | 19,802 | $ 19,802 |
Total assets |  |  | 19,802 | 19,802 |
Liabilities |  |  | 8,615 | 8,615 |
Total liabilities |  |  | 8,615 | 8,615 |
Carrying amount of mortgage loans |  |  | 6,700 | 6,700 |
Amount of mortgage loan commitment |  |  | 17,000 | $ 17,000 |
CS 750 W Merrick Rd LLC | VIE |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |
Ownership interest held by the entity (as a percent) |  |  |  | 51.00% |
Assets |  |  | 20,283 | $ 20,283 |
Total assets |  |  | 20,283 | 20,283 |
Liabilities |  |  | 10,604 | 10,604 |
Total liabilities |  |  | 10,604 | 10,604 |
Option to put ownership interest in the venture |  |  |  | $ 17,100 |
Period of option to call ownership interest of another member |  |  |  | 1 year |
Period of option to put ownership interest in venture |  |  |  | 2 years |
Option to call ownership interest of another member |  |  |  | $ 17,100 |
Initiation period for the call option |  |  |  | 12 months |
Accretion liability |  |  |  | $ 9,800 |
CS SDP Newtonville LLC | VIE |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |
Ownership interest held by the entity (as a percent) |  |  |  | 90.00% |
Assets |  |  | 19,190 | $ 19,190 |
Total assets |  |  | 19,190 | 19,190 |
Liabilities |  |  | 12,674 | 12,674 |
Total liabilities |  |  | 12,674 | 12,674 |
Carrying amount of mortgage loans |  |  | 11,800 | 11,800 |
Amount of mortgage loan commitment |  |  | 12,100 | $ 12,100 |
CS Valley Forge Village Storage LLC | VIE |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |
Ownership interest held by the entity (as a percent) |  |  |  | 70.00% |
Assets |  |  | 21,891 | $ 21,891 |
Total assets |  |  | 21,891 | 21,891 |
Liabilities |  |  | 13,866 | 13,866 |
Total liabilities |  |  | 13,866 | 13,866 |
Carrying amount of mortgage loans |  |  | 11,300 | 11,300 |
Amount of mortgage loan commitment |  |  | 12,400 | $ 12,400 |
SH3, LLC | VIE |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  | 2 |  | 1 |
Ownership interest held by the entity (as a percent) |  |  |  | 90.00% |
Assets |  |  | 39,334 | $ 39,334 |
Total assets |  |  | 39,334 | 39,334 |
Liabilities |  |  | 191 | 191 |
Total liabilities |  |  | 191 | $ 191 |
C S Lock Up Anoka LLC | VIE |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |
Number of self-storage facilities owned and operated | facility |  |  |  | 1 |
Ownership interest held by the entity (as a percent) | 50.00% |  |  | 50.00% |
Contribution To Real Estate Venture | $ 3,400 |  |  |  |
Assets |  |  | 12,214 | $ 12,214 |
Total assets |  |  | 12,214 | 12,214 |
Liabilities |  |  | 5,589 | 5,589 |
Total liabilities |  |  | 5,589 | 5,589 |
Carrying amount of mortgage loans |  |  | 5,600 | 5,600 |
Amount of mortgage loan commitment |  |  | $ 6,100 | $ 6,100 |
C S Lock Up Anoka LLC | VIE | Minnesota |  |  |  |  |
Interests in Consolidated Real Estate Joint Ventures |  |  |  |  |
Purchase Price | $ 12,000 |  |  |  |

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