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Borrowings - Additional Information (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | 1 Months Ended | 9 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended | 1 Months Ended |  |  |  |  |  |
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Sep. 30, 2013 UBS Facility borrowings [Member] | Feb. 28, 2013 JPMorgan Facility borrowings [Member] | Sep. 30, 2013 JPMorgan Facility borrowings [Member] | Dec. 31, 2012 JPMorgan Facility borrowings [Member] | Feb. 28, 2013 JPMorgan Facility borrowings [Member] First Year [Member] | Feb. 28, 2013 JPMorgan Facility borrowings [Member] Second Year [Member] | Feb. 28, 2013 Wells Facility borrowings [Member] | Sep. 30, 2013 Wells Facility borrowings [Member] | Dec. 31, 2012 Wells Facility borrowings [Member] | Jan. 31, 2013 Wells Facility borrowings [Member] AAA-rated CMBS [Member] | Feb. 28, 2013 Wells Facility borrowings [Member] AAA-rated CMBS [Member] | Jan. 31, 2013 Wells Facility borrowings [Member] Hilton CMBS [Member] | Feb. 28, 2013 Wells Facility borrowings [Member] Hilton CMBS [Member] | Sep. 30, 2013 Wells Facility borrowings [Member] Minimum [Member] | Dec. 31, 2012 Wells Facility borrowings [Member] Minimum [Member] | Jan. 31, 2013 Wells Facility borrowings [Member] Minimum [Member] AAA-rated CMBS [Member] | Sep. 30, 2013 Wells Facility borrowings [Member] Maximum [Member] | Dec. 31, 2012 Wells Facility borrowings [Member] Maximum [Member] | Jan. 31, 2013 Wells Facility borrowings [Member] Maximum [Member] AAA-rated CMBS [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Option to extend loan agreement, term |  | 364 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable rate basis |  | LIBOR | LIBOR | LIBOR |  |  |  | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR | LIBOR |  |  |  |  |  |
Basis spread on variable rate | 1.55% | 2.50% | 2.50% | 2.50% |  |  |  |  | 1.50% |  | 1.05% | 2.35% | 1.75% | 1.05% | 1.25% | 1.25% | 1.75% | 2.35% | 1.50%
Percent of Pledged Collateral Borrowed | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percent of Collateral in Cash | 22.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Covenant, Minimum Asset Value | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loan extension fees |  |  |  |  | 0.50% | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing under facility | $ 133,333 |  |  |  |  |  | $ 212,343 |  |  |  |  |  |  |  |  |  |  |  |
Extension fee on outstanding repurchase price |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Debt Covenant, Minimum Asset Value + References No definition available. + Details
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- Definition Debt instrument extended maturity period. + References No definition available. + Details
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- Definition Extension fees as percentage of outstanding balance. + References No definition available. + Details
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- Definition Loan extension fees. + References No definition available. + Details
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- Definition Percent of Collateral in Cash + References No definition available. + Details
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- Definition Percent of Pledged Collateral Borrowed + References No definition available. + Details
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- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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