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Commitments and Contingencies Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2013
Commitments and Contingencies Disclosure [Abstract] |
Operating Leases Future Minimum Payments Due [Table Text Block] | Ground Rent Future minimum rental payments under the terms of all non-cancelable ground leases under which the Company is the lessee are expensed on a straight-line basis regardless of when payments are due. The Company’s ground leases have remaining lease terms ranging from 16 to 90 years. Minimum future rental payments on non-cancelable leases at March 31, 2013 are as follows (in thousands):
2013 (nine months remaining) | $ | 1,364 |
2014 | 1,818 |
2015 | 1,818 |
2016 | 1,909 |
2017 | 1,909 |
Thereafter | 288,297 |

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