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Commitments (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Future minimum lease payments |  |  |
Rent expense | $ 400,000 | $ 366,000 | $ 353,000
Maximum amount of loan | 192,000,000 |  |
Amount drawn and outstanding | 140,516,000 | 57,684,000 |
Office buildings and industrial properties |  |  |
Future minimum lease payments |  |  |
2012 | 107,788,000 |  |
2013 | 105,032,000 |  |
2014 | 101,659,000 |  |
2015 | 86,968,000 |  |
2016 | 78,264,000 |  |
Thereafter (2017-2023) | 193,637,000 |  |
Total | 673,348,000 |  |
Office buildings and industrial properties | Minimum |  |  |
Future minimum lease payments |  |  |
Lease term (in years) | 1 |  |
Corporate office space |  |  |
Future minimum lease payments |  |  |
2012 | 355,000 |  |
2013 | 405,000 |  |
2014 | 417,000 |  |
2015 | 424,000 |  |
2016 | 428,000 |  |
Thereafter (2017-2023) | 324,000 |  |
Total | $ 2,353,000 |  |
Lease term (in years) | 7 |  |
Extension period (in years) | 5 |  |

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