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Noncontrolling Interests (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) shares | Mar. 31, 2017 USD ($) | Dec. 31, 2016 property item | Mar. 30, 2018 shares | Dec. 31, 2017 shares | Jun. 27, 2013 shares | Jan. 22, 2013 shares
Noncontrolling interests |  |  |  |  |  |  |
Conversion ratio | 1 |  |  |  |  |  |
Number of properties acquired | property |  |  | 2 |  |  |  |
Number of joint ventures controlling interest acquired | item |  |  | 2 |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Carrying value at beginning of the period | $ 19,207 |  |  |  |  |  |
Redemptions | (1,468) |  |  |  |  |  |
Shares issued in conjunction with acquisition | 12,144 |  |  |  |  |  |
Distributions | (356) |  |  |  |  |  |
Allocation of net income | 152 | $ 165 |  |  |  |  |
Carrying value at end of the period | $ 29,679 |  |  |  |  |  |
Joint Venture One |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |
Ownership interest (as a percent) | 95.00% |  |  |  |  |  |
Joint Venture Two |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |
Ownership interest (as a percent) | 74.00% |  |  |  |  |  |
Tau Operating Partnership |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |
Realty Income partnership units, ownership interest (as a percent) | 99.40% |  |  |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Carrying value at beginning of the period | $ 13,322 |  |  |  |  |  |
Distributions | (208) |  |  |  |  |  |
Allocation of net income | 77 |  |  |  |  |  |
Carrying value at end of the period | $ 13,191 |  |  |  |  |  |
Number of partnership units issued | shares |  |  |  |  |  |  | 317,022
Number of partnership units outstanding | shares | 317,022 |  |  |  | 317,022 |  |
Realty Income, L.P. |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |
Third party partnership units, ownership interest (as a percent) | 1.10% |  |  |  |  |  |
Realty Income partnership units, ownership interest (as a percent) | 98.90% |  |  |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Carrying value at beginning of the period | $ 2,160 |  |  |  |  |  |
Redemptions | (1,468) |  |  |  |  |  |
Shares issued in conjunction with acquisition | 12,144 |  |  |  |  |  |
Distributions | (72) |  |  |  |  |  |
Allocation of net income | 55 |  |  |  |  |  |
Carrying value at end of the period | $ 12,819 |  |  |  |  |  |
Number of partnership units issued | shares | 242,007 |  |  | 242,007 |  | 534,546 |
Number of partnership units outstanding | shares | 270,189 |  |  |  | 88,182 |  |
Other Noncontrolling Interests |  |  |  |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Carrying value at beginning of the period | $ 3,725 |  |  |  |  |  |
Distributions | (76) |  |  |  |  |  |
Allocation of net income | 20 |  |  |  |  |  |
Carrying value at end of the period | $ 3,669 |  |  |  |  |  |

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