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Noncontrolling Interests - Change in Carrying Value (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 28, 2019 | Apr. 30, 2018 | Mar. 30, 2018 | Jan. 22, 2013 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Carrying value at beginning of the period |  |  |  |  | $ 29,702 |  |
Reallocation of equity |  |  |  |  | 0 | $ 0 | $ 0
Redemptions |  |  |  |  |  | (21,123) | (2,752)
Additions to noncontrolling interest |  |  |  |  | 3,168 | 11,370 | 18,848
Allocation of net income |  |  |  |  | 1,020 | 996 | 984
Carrying value at end of the period |  |  |  |  | $ 32,247 | $ 29,702 |
Tau Operating Partnership units |  |  |  |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Number of partnership units issued (in units) |  |  |  | 317,022 |  |  |
Number of partnership units outstanding (in units) |  |  |  |  | 0 | 0 |
Realty Income, L.P. units |  |  |  |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Additions to noncontrolling interest |  |  |  |  |  | $ 6,300 | $ 18,800
Number of partnership units issued (in units) | 89,322 | 131,790 | 242,007 |  |  | 89,322 | 373,797
Number of partnership units outstanding (in units) |  |  |  |  | 463,119 | 463,119 |
Noncontrolling interests |  |  |  |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Carrying value at beginning of the period |  |  |  |  | $ 29,702 | $ 32,236 |
Reallocation of equity |  |  |  |  | (47) | 653 | $ 774
Redemptions |  |  |  |  |  | (14,257) | (5,581)
Additions to noncontrolling interest |  |  |  |  | 3,168 | 11,370 | 18,848
Distributions |  |  |  |  | (1,596) | (1,296) |
Allocation of net income |  |  |  |  | 1,020 | 996 |
Carrying value at end of the period |  |  |  |  | 32,247 | 29,702 | 32,236
Noncontrolling interests | Tau Operating Partnership units |  |  |  |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Carrying value at beginning of the period |  |  |  |  | 0 | 13,356 |
Reallocation of equity |  |  |  |  | 0 | 0 |
Redemptions |  |  |  |  |  | (13,356) |
Additions to noncontrolling interest |  |  |  |  | 0 | 0 |
Distributions |  |  |  |  | 0 | 0 |
Allocation of net income |  |  |  |  | 0 | 0 |
Carrying value at end of the period |  |  |  |  | 0 | 0 | 13,356
Noncontrolling interests | Realty Income, L.P. units |  |  |  |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Carrying value at beginning of the period |  |  |  |  | 24,596 | 17,912 |
Reallocation of equity |  |  |  |  | (47) | 653 |
Redemptions |  |  |  |  |  | 0 |
Additions to noncontrolling interest |  |  |  |  | 0 | 6,286 |
Distributions |  |  |  |  | (1,297) | (1,219) |
Allocation of net income |  |  |  |  | 848 | 964 |
Carrying value at end of the period |  |  |  |  | 24,100 | 24,596 | 17,912
Noncontrolling interests | Other Noncontrolling Interests |  |  |  |  |  |  |
Change in the carrying value of all noncontrolling interests |  |  |  |  |  |  |
Carrying value at beginning of the period |  |  |  |  | 5,106 | 968 |
Reallocation of equity |  |  |  |  | 0 | 0 |
Redemptions |  |  |  |  |  | (901) |
Additions to noncontrolling interest |  |  |  |  | 3,168 | 5,084 |
Distributions |  |  |  |  | (299) | (77) |
Allocation of net income |  |  |  |  | 172 | 32 |
Carrying value at end of the period |  |  |  |  | $ 8,147 | $ 5,106 | $ 968

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