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Commitments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Future minimum lease payments |  |  |
Rent expense | $ 403,000 | $ 400,000 | $ 366,000
Maximum amount of loan | 118,800,000 |  |
Amount drawn and outstanding | 93,896,000 | 140,516,000 |
Office buildings and industrial properties |  |  |
Future minimum lease payments |  |  |
2013 | 127,789,000 |  |
2014 | 132,025,000 |  |
2015 | 116,155,000 |  |
2016 | 104,296,000 |  |
2017 | 81,397,000 |  |
Thereafter (2018-2024) | 207,774,000 |  |
Total | 769,436,000 |  |
Office buildings and industrial properties | Minimum |  |  |
Future minimum lease payments |  |  |
Lease term | 1 year |  |
Corporate office space |  |  |
Future minimum lease payments |  |  |
2013 | 405,000 |  |
2014 | 417,000 |  |
2015 | 424,000 |  |
2016 | 428,000 |  |
2017 | 324,000 |  |
Total | $ 1,998,000 |  |
Lease term | 7 years |  |
Extension period | 5 years |  |

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