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Commitments (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Commitments |  |  |
Rent expense | $ 420,000 | $ 411,000 | $ 408,000
Maximum amount of loan | 79,500,000 |  |
Amount drawn and outstanding | 71,720,000 | $ 81,780,000 |
Office buildings and industrial properties |  |  |
Future minimum rental income: |  |  |
2017 | 180,321,000 |  |
2018 | 156,530,000 |  |
2019 | 139,250,000 |  |
2020 | 121,185,000 |  |
2021 | 92,803,000 |  |
Thereafter (2021-2029) | 244,075,000 |  |
Total | $ 934,164,000 |  |
Office buildings and industrial properties | Minimum |  |  |
Commitments |  |  |
Lease term | 1 year |  |
Corporate office space |  |  |
Commitments |  |  |
Extension period | 5 years |  |
Future minimum lease payments: |  |  |
2017 | $ 404,000 |  |
2018 | 412,000 |  |
2019 | 421,000 |  |
2020 | 429,000 |  |
2021 | 438,000 |  |
Thereafter | 787,000 |  |
Total | $ 2,891,000 |  |

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