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Supplemental Disclosures of Cash Flow Information - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Mar. 28, 2019 | Jan. 01, 2019 | Apr. 30, 2018 | Mar. 30, 2018
Supplemental Disclosures of Cash Flow Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for interest |  |  |  |  |  |  |  |  | $ 275,300 | $ 251,500 | $ 240,400 |  |  |  |
Interest capitalized to properties under development |  |  |  |  |  |  |  |  | 751 | 369 | 461 |  |  |  |
Cash paid for income taxes |  |  |  |  |  |  |  |  | 4,200 | 4,700 | 3,800 |  |  |  |
Non-cash activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease liabilities | $ 122,285 |  |  |  |  |  |  |  | 122,285 |  |  |  | $ 132,000 |  |
Right-of-use assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 132,000 |  |
Additions to noncontrolling interest |  |  |  |  |  |  |  |  | 11,370 | 18,848 |  |  |  |  |
Revenues | $ 397,529 | $ 374,247 | $ 365,450 | $ 354,365 | $ 342,576 | $ 338,081 | $ 328,886 | $ 318,295 | 1,491,591 | 1,327,838 | 1,215,768 |  |  |  |
Mortgage loans assumed |  |  |  |  |  |  |  |  | $ 130,800 |  |  |  |  |  |
Acquisition of property using funds held in non-refundable escrow account |  |  |  |  |  |  |  |  |  | $ 7,500 |  |  |  |  |
Notes issued for acquisition of a portfolio of properties |  |  |  |  |  |  |  |  |  |  | $ 125,900 |  |  |  |
Realty Income, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of partnership units issued (in units) | 89,322 |  |  |  | 373,797 |  |  |  | 89,322 | 373,797 |  | 89,322 |  | 131,790 | 242,007
Shares issued in conjunction with acquisitions |  |  |  |  |  |  |  |  | $ 6,300 | $ 18,800 |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions to noncontrolling interest |  |  |  |  |  |  |  |  | 11,370 | 18,848 |  |  |  |  |
Noncontrolling interests | Realty Income, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions to noncontrolling interest |  |  |  |  |  |  |  |  | 6,286 | 18,848 |  |  |  |  |
Noncontrolling interests | Other Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-cash activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additions to noncontrolling interest |  |  |  |  |  |  |  |  | $ 5,084 | $ 0 |  |  |  |  |

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