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Favorable Lease Assets (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Boston Westin Waterfront Ground Lease [Member] rooms | Dec. 31, 2010 Boston Westin Waterfront Ground Lease [Member] | Dec. 31, 2011 Boston Westin Waterfront - Lease Right [Member] | Dec. 31, 2010 Boston Westin Waterfront - Lease Right [Member] | Dec. 31, 2011 Boston Westin Waterfront - Lease Right [Member] Minimum [Member] rooms | Dec. 31, 2011 Boston Westin Waterfront - Lease Right [Member] Maximum [Member] rooms | Dec. 31, 2011 Minneapolis Hilton Ground Lease [Member] | Dec. 31, 2010 Minneapolis Hilton Ground Lease [Member] | Jun. 16, 2010 Minneapolis Hilton Ground Lease [Member] | Dec. 31, 2011 Oak Brook Hills Marriot Resort Ground Lease [Member] | Dec. 31, 2010 Oak Brook Hills Marriot Resort Ground Lease [Member] | Dec. 31, 2011 Radisson Lexington Restaurant Leases [Member] | Dec. 31, 2010 Radisson Lexington Restaurant Leases [Member]
Indefinite-lived Intangible Assets by Major Class [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying amount of the lease right | $ 43,285,000 | $ 42,622,000 |  | $ 18,941,000 | $ 19,156,000 | $ 9,513,000 | $ 9,513,000 |  |  | $ 5,985,000 | $ 6,059,000 |  | $ 7,352,000 | $ 7,894,000 | $ 1,494,000 | $ 0
Favorable Lease Assets (Textuals) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, amortization expense | 900,000 | 800,000 | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Business acquisition purchase price allocation favorable lease asset |  |  |  |  |  |  |  |  |  | 6,100,000 |  | 6,100,000 |  |  | 1,586,000 |
Number of room hotels for development for which favorable lease assets are owned (in rooms) |  |  |  |  |  |  |  | 320 | 350 |  |  |  |  |  |  |
Impairment of intangible assets, finite-lived | $ 0 | $ 0 | $ 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of room hotels based on which estimated were made for rent (in rooms) |  |  |  | 327 |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Aggregate amount of intangible asset amortization recognized as expense during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -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 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275 + Details
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