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Borrowings - Weighted Average Maturities and Interest Rates of Borrowings (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2013 | Sep. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |  |
Debt Balance |  | $ 227,167 |  | $ 225,158 |
Weighted Average Remaining Maturity |  | 2 years 2 months 12 days |  | 1 year 1 month 6 days |
Weighted average interest rate |  | 1.90% |  | 1.80% |
Wells Facility borrowings [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Balance |  | 156,969 | [1] | 225,155 | [1]
Weighted Average Remaining Maturity |  | 10 months 24 days | [1],[2] | 1 year 1 month 6 days | [1],[2]
Weighted average interest rate |  | 1.40% | [1] | 1.80% | [1]
Variable rate basis |  | LIBOR |  | LIBOR |
Basis points |  |  |  | 1.50% |
Wells Facility borrowings [Member] | Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 1.05% |  | 1.25% |
Wells Facility borrowings [Member] | Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis points |  | 1.75% |  | 2.35% |
UBS Facility borrowings [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Balance |  | 70,195 |  |  |
Weighted Average Remaining Maturity |  | 5 years |  |  |
Weighted average interest rate |  | 2.90% |  |  |
Basis points |  | 1.55% |  |  |
JPMorgan Facility borrowings [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt Balance |  | $ 3 |  | $ 3 |
Weighted Average Remaining Maturity |  | 1 year 3 months 18 days | [2] | 5 days |
Weighted average interest rate |  | 2.70% |  | 2.70% |
Variable rate basis | LIBOR | LIBOR |  | LIBOR |
Basis points | 2.50% | 2.50% |  | 2.50% |
[1] | At December 31, 2012, borrowings outstanding under the Wells Facility bore interest at LIBOR plus 125 basis points, 150 basis points or 235 basis points depending on the collateral pledged. At September 30, 2013, borrowings outstanding under the Wells Facility bore interest at LIBOR plus 105 basis points or 175 basis points depending on the collateral pledged.
[2] | Assumes extension options are exercised.

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- Definition Repurchase agreements maturity. + 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 Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time. + References No definition available. + Details
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- Definition Carrying value, as of the balance sheet date, of securities sold under agreements to repurchase where the transferor maintains effective control over the assets, accounting for them as secured debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)) -URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 10 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=7580763&loc=d3e101761-111710 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 48, 100 -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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