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Leases (Tables) | 12 Months Ended
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Dec. 31, 2017
Leases [Abstract] |
Summary of income from commercial rents included in real estate revenue | The following is a summary of income from commercial rents included in real estate revenue as of December 31:
|  | 2017 |  | 2016 |  | 2015
Base rent |  | $ | 5,711,000 |  |  | $ | 5,613,000 |  |  | $ | 5,208,000 |
Percentage rent |  | $ | 677,000 |  |  | $ | 495,000 |  |  | $ | 652,000 |
Schedule of future minimum rental income | Future minimum rental income on commercial, communication and right-of-way on non-cancelable leases as of December 31, 2017:
2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Thereafter
$ | 5,715 |  |  | $ | 5,635 |  |  | $ | 5,555 |  |  | $ | 5,309 |  |  | $ | 5,113 |  |  | $ | 21,679 |

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