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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 |  |  |  |  |  |  |  |

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- Definition Cash payments to lessor's for use of assets under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 27 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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