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Financing Arrangements, Portfolio Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Banking and Thrift [Abstract] |
Schedule of Borrowings Under Financing Arrangements and Assets Pledged as Collateral | The following table presents detailed information about the Company’s borrowings under financing arrangements and associated assets pledged as collateral at March 31, 2018 and December 31, 2017 (dollar amounts in thousands):
| March 31, 2018 |  | December 31, 2017
| Outstanding Financing Arrangements |  | Fair Value of Collateral Pledged |  | Amortized Cost of Collateral Pledged |  | Outstanding Financing Arrangements |  | Fair Value of Collateral Pledged |  | Amortized Cost of Collateral Pledged
Agency ARMs RMBS | $ | 80,977 |  |  | $ | 84,361 |  |  | $ | 87,132 |  |  | $ | 86,349 |  |  | $ | 90,343 |  |  | $ | 92,586 |
Agency Fixed-rate RMBS | 853,390 |  |  | 902,219 |  |  | 933,829 |  |  | 842,474 |  |  | 890,359 |  |  | 902,744 |
Non-Agency RMBS | 37,016 |  |  | 49,205 |  |  | 48,269 |  |  | 38,160 |  |  | 51,841 |  |  | 50,693 |
CMBS (1) | 315,931 |  |  | 435,118 |  |  | 323,042 |  |  | 309,935 |  |  | 421,156 |  |  | 322,092 |
Balance at end of the period | $ | 1,287,314 |  |  | $ | 1,470,903 |  |  | $ | 1,392,272 |  |  | $ | 1,276,918 |  |  | $ | 1,453,699 |  |  | $ | 1,368,115 |
(1) | Includes first loss PO and mezzanine CMBS securities with a fair value amounting to $393.4 million and $377.5 million included in the Consolidated K-Series as of March 31, 2018 and December 31, 2017, respectively.
Schedule of Contractual Maturities of Outstanding Financing Arrangements | The following table presents contractual maturity information about the Company’s outstanding financing arrangements, at March 31, 2018 and December 31, 2017 (dollar amounts in thousands):
Contractual Maturity | March 31, 2018 |  | December 31, 2017
Within 30 days | $ | 539,990 |  |  | $ | 1,081,911 |
Over 30 days to 90 days | 647,324 |  |  | 95,007 |
Over 90 days | 100,000 |  |  | 100,000 |
Total | $ | 1,287,314 |  |  | $ | 1,276,918 |

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- Definition Outstanding repurchase agreements by contractual maturity. + References No definition available. + Details
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- Definition Tabular disclosure of financial instruments held by the entity for its own account for trading or investment purposes that are carried at fair value and pledged to counterparties as collateral for financing transactions. Description may include equity, fixed income, debt or other securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 + Details
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