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Commitments and Contingencies (Ground Leases) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2012
hotels
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Bethesda Marriott Suites [Member]
Number_of_renewal_terms
Dec. 31, 2012
Courtyard Manhattan / Fifth Avenue [Member]
Number_of_renewal_terms
Dec. 31, 2009
Marriott Salt Lake City Downtown [Member]
Dec. 31, 2012
Marriott Salt Lake City Downtown [Member]
Ground_leases
Dec. 31, 2012
Boston Westin Waterfront [Member]
Number_of_renewal_terms
Dec. 31, 2012
Hilton Minneapolis [Member]
Number_of_renewal_terms
Dec. 31, 2012
Oak Brook Hills Marriot Resort [Member]
acre
Dec. 31, 2012
Renaissance Worthington [Member]
Ground_leases
Number_of_renewal_terms
Real Estate Properties [Line Items]                      
Number of properties subject to ground leases (in hotels) 5           2        
Number of renewal periods (in ones)       0 1     0 0   3
Interest in land under hotel (as a percent of ownership)           21.00%          
Cost to purchase interest in land under hotel           $ 0.9          
Ground leases (in acres)                   110  
Ground leases renewal option (in years)         49 years           15 years
Parking garages subject to ground leases                     3
Percentage of land on which the parking garage is constructed                     25.00%
Ground rent expense 14.6 14.2 11.7                
Cash paid for ground rent $ 8.2 $ 7.3 $ 4.6