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Investments in Debt Securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | $ 2,446,491 |  | $ 2,422,883 |  |
Available-for-sale Securities, Net Premium (Discount) |  | 736,128 |  | 822,084 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 3,182,619 |  | 3,244,967 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 17,185 |  | 19,643 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (26,285) |  | (52,526) |  |
Available-for-sale Securities, Fair Value |  | 3,173,519 |  | 3,212,084 |  |
Available-for-sale Securities, Sale Proceeds |  | 1,073,093 |  | 87,818 |  | $ 449,921
Available-for-sale Securities, Gross Realized Gains |  | 0 |  |  |  |
Available-for-sale Securities, Gross Realized Gain (Loss) |  | (11,530) |  | (4,238) |  | (978)
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis |  | 4,480 |  | 12,375 |  |
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Amortized Cost Basis |  | 208,046 |  | 228,443 |  |
Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Basis |  | 1,334,795 |  | 1,060,273 |  |
Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis |  | 1,635,298 |  | 1,943,876 |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis |  | 3,182,619 |  | 3,244,967 |  |
Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value |  | 4,542 |  | 12,189 |  |
Available-for-sale Securities, Debt Maturities, Rolling Year Two Through Five, Fair Value |  | 210,727 |  | 235,059 |  |
Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value |  | 1,326,178 |  | 1,040,609 |  |
Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value |  | 1,632,072 |  | 1,924,227 |  |
Available-for-sale Securities, Debt Maturities, Single Maturity Date |  | 3,173,519 |  | 3,212,084 |  |
Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Fair Value |  | 1,293,798 |  | 1,738,094 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss |  | $ (9,769) |  | $ (38,469) |  |
Available-for-sale Securities, Number of Securities in Continuous Unrealized Loss Position for less than 12 months |  | 71 |  | 133 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position for 12 months or longer, Fair Value |  | $ 423,698 |  | $ 427,405 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss |  | $ (14,035) |  | $ (8,952) |  |
Available-for-sale Securities, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer |  | 30 |  | 72 |  |
Non-Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Fair Value |  | $ 51,406 |  | $ 205,484 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss |  | $ (421) |  | $ (2,773) |  |
Available-for-sale Securities, Number of Securities in Continuous Unrealized Loss Position for less than 12 months |  | 11 |  | 48 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position for 12 months or longer, Fair Value |  | $ 20,414 |  | $ 81,660 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss |  | $ (323) |  | $ (2,332) |  |
Available-for-sale Securities, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer |  | 12 |  | 26 |  |
U.S. Treasuries |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | $ 148,400 |  |  |  |
Available-for-sale Securities, Net Premium (Discount) |  | (133) |  |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 148,267 |  |  |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  |  |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (1,737) |  |  |  |
Available-for-sale Securities, Fair Value |  | $ 146,530 |  |  |  |
Available-for-sale Securities, Weighted Average Coupon |  | 2.13% |  |  |  |
Available-for-sale Securities, Sale Proceeds |  | $ 51,797 |  | $ 0 |  | 0
Available-for-sale Securities, Gross Realized Losses |  | (244) |  | 0 |  | 0
CMBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | 1,150,468 |  | 1,232,053 |  |
Available-for-sale Securities, Net Premium (Discount) |  | 6,407 |  | 7,150 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 1,156,875 |  | 1,239,203 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 5,812 |  | 11,676 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (13,572) |  | (28,108) |  |
Available-for-sale Securities, Fair Value |  | 1,149,115 |  | 1,222,771 |  |
CMBS | Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | 1,123,967 |  | 1,152,586 |  |
Available-for-sale Securities, Net Premium (Discount) |  | 10,442 |  | 13,868 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 1,134,409 |  | 1,166,454 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 3,514 |  | 6,209 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (13,572) |  | (28,108) |  |
Available-for-sale Securities, Fair Value |  | $ 1,124,351 |  | $ 1,144,555 |  |
Available-for-sale Securities, Weighted Average Coupon | [1] | 3.03% |  | 3.12% |  |
Available-for-sale Securities, Sale Proceeds |  | $ 252,624 |  | $ 0 |  | 149,360
Available-for-sale Securities, Gross Realized Losses |  | (135) |  | 0 |  | (604)
CMBS | Non-Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | 26,501 |  | 79,467 |  |
Available-for-sale Securities, Net Premium (Discount) |  | (4,035) |  | (6,718) |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 22,466 |  | 72,749 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 2,298 |  | 5,467 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | 0 |  | 0 |  |
Available-for-sale Securities, Fair Value |  | $ 24,764 |  | $ 78,216 |  |
Available-for-sale Securities, Weighted Average Coupon | [1] | 5.47% |  | 4.72% |  |
Available-for-sale Securities, Sale Proceeds |  | $ 35,705 |  | $ 33,640 |  | 30,775
Available-for-sale Securities, Gross Realized Losses |  |  |  | (1,228) |  | (566)
Available-for-sale Securities, Gross Realized Gains |  | (1,199) |  |  |  |
CMBS IO |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | 0 |  | 0 |  |
Available-for-sale Securities, Net Premium (Discount) |  | 683,833 |  | 757,892 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 683,833 |  | 757,892 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 9,706 |  | 5,071 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (1,017) |  | (8,417) |  |
Available-for-sale Securities, Fair Value |  | 692,522 |  | 754,546 |  |
CMBS IO | Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | 0 | [2] | 0 | [3] |
Available-for-sale Securities, Net Premium (Discount) |  | 375,361 |  | 411,737 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 375,361 |  | 411,737 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 5,238 |  | 3,523 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (293) |  | (3,362) |  |
Available-for-sale Securities, Fair Value |  | $ 380,306 |  | $ 411,898 |  |
Available-for-sale Securities, Weighted Average Coupon | [1] | 0.62% |  | 0.67% |  |
Notional balance for interest only securities |  | $ 14,196,122 |  | $ 13,106,912 |  |
Available-for-sale Securities, Sale Proceeds |  | 0 |  | 0 |  | 45,096
Available-for-sale Securities, Gross Realized Gains |  |  |  | 0 |  | (1,698)
CMBS IO | Non-Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance | [2] | 0 |  |  |  |
Available-for-sale Securities, Net Premium (Discount) |  | 308,472 |  | 346,155 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 308,472 |  | 346,155 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 4,468 |  | 1,548 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (724) |  | (5,055) |  |
Available-for-sale Securities, Fair Value |  | $ 312,216 |  | $ 342,648 |  |
Available-for-sale Securities, Weighted Average Coupon | [1] | 0.61% |  | 0.61% |  |
Notional balance for interest only securities |  | $ 11,006,463 |  | $ 10,884,964 |  |
Available-for-sale Securities, Sale Proceeds |  | 0 |  | 0 |  | 50,125
Available-for-sale Securities, Gross Realized Gains |  | 0 |  | 0 |  | (1,359)
RMBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | 1,147,623 |  | 1,190,830 |  |
Available-for-sale Securities, Net Premium (Discount) |  | 46,021 |  | 57,042 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 1,193,644 |  | 1,247,872 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 1,667 |  | 2,896 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (9,959) |  | (16,001) |  |
Available-for-sale Securities, Fair Value |  | 1,185,352 |  | 1,234,767 |  |
RMBS | Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | 1,146,553 | [4] | 1,157,258 |  |
Available-for-sale Securities, Net Premium (Discount) |  | 46,021 | [4] | 57,066 |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 1,192,574 | [4] | 1,214,324 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 1,626 | [4] | 2,832 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (9,939) | [4] | (15,951) |  |
Available-for-sale Securities, Fair Value |  | $ 1,184,261 | [4] | $ 1,201,205 |  |
Available-for-sale Securities, Weighted Average Coupon | [1] | 3.56% | [4] | 3.05% |  |
Available-for-sale Securities, Sale Proceeds |  | $ 716,560 |  | $ 54,178 |  | 174,565
Available-for-sale Securities, Gross Realized Losses |  | (12,392) |  | (3,010) |  | (2,865)
RMBS | Non-Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Par Balance |  | 1,070 |  | 33,572 |  |
Available-for-sale Securities, Net Premium (Discount) |  | 0 |  | (24) |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 1,070 |  | 33,548 |  |
Available-for-sale Securities, Gross Unrealized Gain |  | 41 |  | 64 |  |
Available-for-sale Securities, Gross Unrealized Loss |  | (20) |  | (50) |  |
Available-for-sale Securities, Fair Value |  | $ 1,091 |  | $ 33,562 |  |
Available-for-sale Securities, Weighted Average Coupon | [1] | 6.75% |  | 3.58% |  |
Available-for-sale Securities, Sale Proceeds |  | $ 16,407 |  | $ 0 |  | 0
Available-for-sale Securities, Gross Realized Gains |  | $ (42) |  | $ 0 |  | $ 0
[1] | The weighted average coupon (“WAC”) is the gross interest rate of the security weighted by the outstanding principal balance (or by notional balance in the case of an IO security).
[2] | The notional balance for Agency CMBS IO and non-Agency CMBS IO was $14,196,122 and $11,006,463, respectively, as of December 31, 2017.
[3] | The notional balance for the Agency CMBS IO and non-Agency CMBS IO was $13,106,912 and $10,884,964, respectively, as of December 31, 2016.
[4] | Includes purchased securities pending settlement.

X
- Definition The remaining amount of investment premium (discount), net, originally recognized at the purchase date of the instruments that has yet to be amortized (accreted) into earnings. + References No definition available. + Details
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- Definition This item represents the current weighted-average gross interest rate earned on this type of MBS in the investment portfolio as of the period indicated. The gross interest rate of each MBS within the portfolio is weighted based on its current outstanding notional or par balance. The current outstanding notional or par balance for each MBS consists of the total of all principal balances remaining on the mortgage loans underlying each MBS. + References No definition available. + Details
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- Definition Notional balance for interest only securities owned by the Company. Interest only securities represent the right to receive excess interest payments, and not principal cash flows, based on the underlying unpaid principal balance (ie, notional) of the underlying pool of mortgage loans. + References No definition available. + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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