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Commitments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Future minimum lease payments |  |  |
Rent expense | $ 412,000 | $ 403,000 | $ 400,000
Maximum amount of loan | 111,800,000 |  |
Amount drawn and outstanding | 99,746,000 | 93,896,000 |
Office buildings and industrial properties |  |  |
Future minimum lease payments |  |  |
2014 | 176,681,000 |  |
2015 | 165,974,000 |  |
2016 | 155,794,000 |  |
2017 | 133,345,000 |  |
2018 | 117,955,000 |  |
Thereafter (2019-2026) | 243,743,000 |  |
Total | 993,492,000 |  |
Office buildings and industrial properties | Minimum |  |  |
Future minimum lease payments |  |  |
Lease term | 1 year |  |
Corporate office space |  |  |
Future minimum lease payments |  |  |
2014 | 417,000 |  |
2015 | 424,000 |  |
2016 | 428,000 |  |
2017 | 324,000 |  |
Total | $ 1,593,000 |  |
Lease term | 7 years |  |
Extension period | 5 years |  |

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