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Borrowings - Summary of Outstanding Balances, Maximum and Average Balances of Borrowings (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |  |
Balance | $ 227,167 |  | $ 225,158 |
Wells Facility borrowings [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance | 156,969 | [1] | 225,155 | [1]
Maximum Month-End Balance | 225,156 |  |  |
Average Month-End Balance | 197,146 |  |  |
UBS Facility borrowings [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance | 70,195 |  |  |
Maximum Month-End Balance | 70,195 |  |  |
Average Month-End Balance | 7,020 |  |  |
JPMorgan Facility borrowings [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Balance | 3 |  | 3 |
Maximum Month-End Balance | 3 |  |  |
Average Month-End Balance | $ 3 |  |  |
[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.

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- Definition Debt instrument average outstanding amount. + References No definition available. + Details
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- Definition Debt instrument maximum month end outstanding amount. + 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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