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Commitments and Contingencies (Details) (USD $)
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1 Months Ended |
0 Months Ended |
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Aug. 31, 2010
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Apr. 15, 2015
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Mar. 31, 2015
Property
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| Tax incremental financing obligation |
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| The amount of tax incremental financing bonds issued by Anne Arundel County, Maryland |
$ 30,000,000 |
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| Liability recognized with regard to tax incremental financing obligation at end of current period |
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1,400,000 |
| Environmental Indemnity Agreement |
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| Number of lease properties which were provided environmental indemnifications |
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3 |
| Environmental indemnification to the tenant against losses covered under prior owner's indemnity agreement |
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5,000,000.0 |
| Maximum environmental indemnification to the tenant against consequential damages after acquisition of property |
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12,500,000.0 |
| Additional costs agreed to be paid by the entity related to construction and environmental regulatory activities (as a percent) |
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50.00% |
| Maximum annual additional costs agreed to be paid by the entity related to construction and environmental regulatory activities |
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300,000 |
| Maximum additional costs agreed to be paid by the entity related to construction and environmental regulatory activities |
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1,500,000.0 |
| Subsequent Event | 2600 Park Tower Drive | Virginia |
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| Other Commitments [Line Items] |
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| Square footage of real estate properties (in square feet) |
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240,000 |
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| Acquired property percentage leased |
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100.00% |
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| Total acquisition cost |
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$ 83,000,000 |
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