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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended | 3 Months Ended |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2012 property | Dec. 31, 2011 | Dec. 31, 2010 | Mar. 31, 2012 Hotels | Dec. 31, 2012 Hotels property | Dec. 31, 2012 Hotels Sonesta No. 1 agreement property | Jan. 31, 2012 Hotels Sonesta Hotel in Cambridge and New Orleans | Dec. 31, 2012 Buildings and improvements Maximum | Dec. 31, 2012 Personal property Maximum
Consolidation |  |  |  |  |  |  |  |  |
Ownership interest in subsidiaries (as a percent) | 100.00% |  |  |  |  |  |  |  |
Real Estate Properties |  |  |  |  |  |  |  |  |
Estimated useful life |  |  |  |  |  |  |  | 40 years | 12 years
Losses on asset impairment charges | $ 8,547 | $ 16,384 | $ 163,681 | $ 889 |  |  |  |  |
Number of real estate properties | 474 |  |  |  | 289 | 20 |  |  |
Goodwill |  |  |  |  |  |  |  |  |
Goodwill related to acquisition of hotels |  |  |  |  |  |  | 7,658 |  |
Goodwill impairment loss | $ 7,658 |  |  |  |  |  |  |  |

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