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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