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Supplemental Disclosures of Cash Flow Information - Narrative (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 28, 2019 | Apr. 30, 2018 | Mar. 30, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2019
Supplemental Disclosures of Cash Flow Information |  |  |  |  |  |  |
Cash paid for interest |  |  |  | $ 285,600 | $ 275,300 | $ 251,500 |
Cash paid for income taxes |  |  |  | 13,100 | 4,200 | 4,700 |
Non-cash activities |  |  |  |  |  |  |
Non-refundable deposits applied to acquisitions |  |  |  | 13,800 |  | 7,500 |
Lease liabilities |  |  |  | 114,559 | 122,285 |  |
Right-of-use assets |  |  |  | 112,049 | 120,533 |  |
Additions to noncontrolling interest |  |  |  | 3,168 | 11,370 | 18,848 |
Mortgage loans assumed |  |  |  |  | 130,800 |  |
Noncontrolling interests |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |
Additions to noncontrolling interest |  |  |  | 3,168 | $ 11,370 | $ 18,848 |
Realty Income, L.P. units |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |
Number of partnership units issued (in units) | 89,322 | 131,790 | 242,007 |  | 89,322 | 373,797 |
Additions to noncontrolling interest |  |  |  |  | $ 6,300 | $ 18,800 |
Realty Income, L.P. units | Noncontrolling interests |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |
Additions to noncontrolling interest |  |  |  | 0 | 6,286 |  |
Other Noncontrolling Interests | Noncontrolling interests |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |
Additions to noncontrolling interest |  |  |  | 3,168 | $ 5,084 |  |
ASU 2016-02 |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  | $ 132,000
Right-of-use assets |  |  |  |  |  |  | $ 132,000
Derivative |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |
Decrease in fair value of derivatives |  |  |  | $ 55,200 |  |  |

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