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Revenue Recognition (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Disaggregation of Revenue | The following is a summary of revenue sources for the years ended December 31, 2020, 2019 and 2018.
|  | Year Ended December 31,
(Amounts in thousands) |  | 2020 |  | 2019 |  | 2018
Lease revenues (1) |  | $ | 191,416 |  |  | $ | 217,251 |  |  | $ | 223,388 |
Parking revenue |  | 4,207 |  |  | 5,608 |  |  | 5,680 |
Tenant services |  | 3,519 |  |  | 3,491 |  |  | 3,757 |
Rental revenues |  | $ | 199,142 |  |  | $ | 226,350 |  |  | $ | 232,825 |
(1) Reduced by $14,959 and $209 for the years ended December 31, 2020 and 2019, respectively, for the write-off of lease receivables deemed uncollectable (primarily write-offs of receivables arising from the straight-lining of rents).
Operating Lease, Lease Income | The components of lease revenues for the years ended December 31, 2020 and 2019 are as follows:
|  | Year Ended December 31,
(Amounts in thousands) |  | 2020 |  | 2019
Fixed lease revenues |  | $ | 120,395 |  |  | $ | 142,679 |
Variable lease revenues |  | 71,021 |  |  | 74,572 |
Lease revenues |  | $ | 191,416 |  |  | $ | 217,251 |

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