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Commitments and Contingencies | 12 Months Ended
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Dec. 31, 2011
Commitments and Contingencies [Abstract] |
Commitments and Contingencies | 15. Commitments and Contingencies Twelve properties have leases granting the tenants options to purchase the property. Such options are exercisable at various times at appraised fair market value or at a fixed purchase price in excess of our depreciated cost of the asset. We have no notice of any exercise of any tenant purchase option. At December 31, 2011, we had letters of credit outstanding and performance bonds in the aggregate amount of $6,780. These letters of credit expire between February 2012 and July 2013. In the normal course of business, we are involved in legal actions arising from the ownership of our industrial properties. In our opinion, the liabilities, if any, that may ultimately result from such legal actions are not expected to have a materially adverse effect on our consolidated financial position, operations or liquidity. Ground and Operating Lease Agreements For the years ended December 31, 2011, 2010 and 2009, we recognized $1,955, $3,047 and $4,181, respectively, in operating and ground lease expense. Future minimum rental payments under the terms of all non-cancelable ground and operating leases under which we are the lessee, offset by sub-lease rental payments under non-cancelable operating leases, as of December 31, 2011, are as follows:
2012 |  | $ | 1,892 |
2013 |  |  | 1,724 |
2014 |  |  | 1,448 |
2015 |  |  | 1,319 |
2016 |  |  | 1,321 |
Thereafter |  |  | 28,052 |
Total |  | $ | 35,756 |

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