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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, 2011
hotels
Ground_leases
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2011
Bethesda Marriott Suites [Member]
Number_of_renewal_terms
Dec. 31, 2011
Courtyard Manhattan / Fifth Avenue [Member]
Number_of_renewal_terms
Dec. 31, 2009
Marriott Salt Lake City Downtown [Member]
Dec. 31, 2011
Marriott Salt Lake City Downtown [Member]
Ground_leases
Dec. 31, 2011
Boston Westin Waterfront [Member]
Number_of_renewal_terms
Dec. 31, 2011
Hilton Minneapolis [Member]
Number_of_renewal_terms
Dec. 31, 2011
Marriott Griffin Gate Resort [Member]
acre
Dec. 31, 2011
Oak Brook Hills Marriot Resort [Member]
acre
Dec. 31, 2011
Renaissance Worthington [Member]
Number_of_renewal_terms
Ground_leases
Jan. 18, 2011
Times Square 42nd St [Member]
Minimum [Member]
rooms
Jan. 18, 2011
Times Square 42nd St [Member]
Maximum [Member]
rooms
Real Estate Properties [Line Items]                            
Business acquisition number of rooms acquired (in rooms)                         249 282
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                
Golf courses adjacent to hotels subject to ground lease agreements 2                          
Ground leases (in acres)                   54 110      
Parking garages subject to ground leases                       3    
Parking garage constructed over land ground leases (as a percent)                       25.00%    
Ground rent expense 14.2 11.7 9.5                      
Cash paid for ground rent $ 7.3 $ 4.6 $ 1.8                      
Ground leases renewal option (in years)         49 years             15 years