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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 |
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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 |  |

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