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Properties, net (Details 3) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 property | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2011 property | Dec. 31, 2011 Non-operating properties | Jun. 30, 2011 Non-operating properties | Mar. 31, 2011 Non-operating properties | Dec. 31, 2011 Non-operating properties | Dec. 31, 2011 Operating properties, net | Jun. 30, 2011 Operating properties, net | Dec. 31, 2011 Operating properties, net | Mar. 31, 2011 Fort Ritchie Non-operating properties
Strategic Reallocation Plan and Impairment Losses |  |  |  |  |  |  |  |  |  |  |  |
Aggregate non-cash impairment losses on properties included in disposition plan |  |  |  | $ 122,500,000 |  |  |  |  |  |  |  |
Non-cash impairment losses on properties included in disposition plan in discontinued operations |  |  |  | 23,256,000 |  |  |  |  |  |  |  |
Income tax benefit of aggregate non-cash impairment losses on properties included in disposition plan |  |  |  | 8,700,000 |  |  |  |  |  |  |  |
Estimated net proceeds from Strategic Reallocation Plan |  |  |  | 441,000,000 |  |  |  |  |  |  |  |
Number of real estate properties included in disposition plan | 83 |  |  | 83 |  |  |  |  |  |  |  |
Estimated aggregate fair value of the properties included in the Strategic Reallocation Plan | 562,000,000 |  |  | 562,000,000 |  |  |  |  |  |  |  |
Properties |  |  |  |  |  |  |  |  |  |  |  |
Additional impairment losses on goodwill |  |  |  |  |  |  |  |  |  |  | 803,000 |
Non-cash impairment losses |  |  |  |  |  |  |  |  |  |  |  | 27,700,000
Impairment losses recognized | $ 78,674,000 | $ 44,605,000 | $ 27,742,000 | $ 151,021,000 | $ 39,193,000 | $ 13,574,000 | $ 27,742,000 | $ 80,509,000 | $ 39,481,000 | $ 31,031,000 | $ 70,512,000 |

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- Definition Represents the aggregate impairment loss recognized during the period related to properties included in disposition plan, including amounts in continuing and discontinued operations. + References No definition available. + Details
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