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Properties, net (Tables) | 9 Months Ended
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Sep. 30, 2012
Real Estate [Abstract] |
Schedule of operating properties, net | Operating properties, net consisted of the following (in thousands):
| September 30, 2012 |  | December 31, 2011
Land | $ | 427,559 |  |  | $ | 472,483 |
Buildings and improvements | 2,626,084 |  |  | 2,801,252 |
Less: accumulated depreciation | (565,724 | ) |  | (559,679 | )
Operating properties, net | $ | 2,487,919 |  |  | $ | 2,714,056 |
Schedule of projects in development or held for future development | Projects we had in development or held for future development consisted of the following (in thousands):
| September 30, 2012 |  | December 31, 2011
Land | $ | 220,234 |  |  | $ | 229,833 |
Construction in progress, excluding land | 394,361 |  |  | 409,086 |
Projects in development or held for future development | $ | 614,595 |  |  | $ | 638,919 |
Schedule of operating property dispositions | Operating property dispositions during the nine months ended September 30, 2012 consisted of the following (dollars in thousands):
Project Name |  | Location |  | Date of Sale |  | Number of Buildings |  | Total Rentable Square Feet |  | Transaction Value |  | Gain on Disposition
White Marsh Portfolio Disposition |  | White Marsh, Maryland |  | 1/30/2012 |  | 5 |  |  | 163,000 |  |  | $ | 19,100 |  |  | $ | 2,445 |
1101 Sentry Gateway |  | San Antonio, Texas |  | 1/31/2012 |  | 1 |  |  | 95,000 |  |  | 13,500 |  |  | 1,739 |
222 and 224 Schilling Circle |  | Hunt Valley, Maryland |  | 2/10/2012 |  | 2 |  |  | 56,000 |  |  | 4,400 |  |  | 102 |
15 and 45 West Gude Drive |  | Rockville, Maryland |  | 5/2/2012 |  | 2 |  |  | 231,000 |  |  | 49,107 |  |  | — |
11800 Tech Road |  | Silver Spring, Maryland |  | 6/14/2012 |  | 1 |  |  | 240,000 |  |  | 21,300 |  |  | — |
400 Professional Drive |  | Gaithersburg, Maryland |  | 7/2/2012 |  | 1 |  |  | 130,000 |  |  | 16,198 |  |  | — |
July 2012 Portfolio Disposition |  | Baltimore/Washington Corridor and Greater Baltimore |  | 7/24/2012 |  | 23 |  |  | 1,387,000 |  |  | 161,901 |  |  | 16,908 |
|  |  |  |  |  | 35 |  |  | 2,302,000 |  |  | $ | 285,506 |  |  | $ | 21,194 |
Schedule of impairment losses recognized by period of recognition and by property classification | The table below sets forth the impairment losses and exit costs recognized in the nine months ended September 30, 2012 by period of recognition and by property classification (in thousands):
| Three Months Ended
| 9/30/2012 |  | 6/30/2012 |  | 3/31/2012 |  | Total
Operating properties | $ | 55,829 |  |  | $ | 2,354 |  |  | $ | 11,833 |  |  | $ | 70,016 |
Non-operating properties | — |  |  | — |  |  | (5,246 | ) |  | (5,246 | )
Total | $ | 55,829 |  |  | $ | 2,354 |  |  | $ | 6,587 |  |  | $ | 64,770 |
Schedule of Purchase Price Allocation | The table below sets forth the allocation of the acquisition costs of this property (in thousands):
Land, operating properties |  | $ | 3,507 |
Building and improvements |  | 30,177 |
Intangible assets on real estate acquisitions |  | 14,993 |
Total assets |  | 48,677 |
Below-market leases |  | (369 | )
Total acquisition cost |  | $ | 48,308 |
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination | Intangible assets recorded in connection with the above acquisition included the following (dollars in thousands):
|  |  | Weighted Average Amortization Period (in Years)
Tenant relationship value | $ | 7,472 |  |  | 10
In-place lease value | 7,109 |  |  | 5
Above-market leases | 412 |  |  | 5
| $ | 14,993 |  |  | 7

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- Definition Tabular disclosure for impairment of long-lived assets held and used by an entity which includes a description of the impaired long-lived asset and facts and circumstances leading to the impairment, aggregate amount of the impairment loss and where the loss is located in the income statement, method(s) for determining fair value, and the segment in which the impaired long-lived asset is reported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section CC -Subsection 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 + Details
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- Definition Tabular disclosure of finite-lived intangible assets acquired as part of a business combination, by major class (assets that can be grouped together because they are similar, either by their nature or by their use in operations of the entity) and in total, including the value of the asset acquired, any significant residual value (the expected value of the asset at the end of its useful life) and the weighted-average amortization period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275 + Details
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