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Mortgage Backed Securities Mortgage backed securities designated as AFS (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance |  | $ 2,382,620 |  |  | $ 2,422,883 |
Available-for-sale MBS, Unamortized Premium (Discount) |  | 816,981 |  |  | 822,084 |
Available-for-sale MBS, Amortized Cost |  | 3,199,601 |  |  | 3,244,967 |
Available-for-sale MBS, Gross Unrealized Gain |  | 23,541 |  |  | 19,643 |
Available-for-sale MBS, Gross Unrealized Loss |  | (36,393) |  |  | (52,526) |
Available-for-sale MBS, Fair Value |  | 3,186,749 |  |  | 3,212,084 |
Available-for-sale MBS, Sale Proceeds |  | 57,164 |  | $ 77,530 |  |
Available-for-sale MBS, Gross Realized Gain (Loss) |  | 1,708 |  | (3,941) |  |
RMBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance |  | 1,060,177 |  |  | 1,190,830 |
Available-for-sale MBS, Unamortized Premium (Discount) |  | 48,363 |  |  | 57,042 |
Available-for-sale MBS, Amortized Cost |  | 1,108,540 |  |  | 1,247,872 |
Available-for-sale MBS, Gross Unrealized Gain |  | 3,008 |  |  | 2,896 |
Available-for-sale MBS, Gross Unrealized Loss |  | (10,379) |  |  | (16,001) |
Available-for-sale MBS, Fair Value |  | 1,101,169 |  |  | 1,234,767 |
CMBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance |  | 1,322,443 |  |  | 1,232,053 |
Available-for-sale MBS, Unamortized Premium (Discount) |  | 7,535 |  |  | 7,150 |
Available-for-sale MBS, Amortized Cost |  | 1,329,978 |  |  | 1,239,203 |
Available-for-sale MBS, Gross Unrealized Gain |  | 10,590 |  |  | 11,676 |
Available-for-sale MBS, Gross Unrealized Loss |  | (24,387) |  |  | (28,108) |
Available-for-sale MBS, Fair Value |  | 1,316,181 |  |  | 1,222,771 |
CMBS IO |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance |  | 0 |  |  | 0 |
Available-for-sale MBS, Unamortized Premium (Discount) |  | 761,083 |  |  | 757,892 |
Available-for-sale MBS, Amortized Cost |  | 761,083 |  |  | 757,892 |
Available-for-sale MBS, Gross Unrealized Gain |  | 9,943 |  |  | 5,071 |
Available-for-sale MBS, Gross Unrealized Loss |  | (1,627) |  |  | (8,417) |
Available-for-sale MBS, Fair Value |  | 769,399 |  |  | 754,546 |
Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Fair Value |  | 1,568,683 |  |  | 1,738,094 |
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss |  | $ (29,494) |  |  | $ (38,469) |
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for less than 12 months |  | 113 |  |  | 133 |
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Fair Value |  | $ 384,677 |  |  | $ 427,405 |
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss |  | $ (5,865) |  |  | $ (8,952) |
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer |  | 60 |  |  | 72 |
Agency MBS | RMBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance |  | $ 1,033,735 |  |  | $ 1,157,258 |
Available-for-sale MBS, Unamortized Premium (Discount) |  | 48,373 |  |  | 57,066 |
Available-for-sale MBS, Amortized Cost |  | 1,082,108 |  |  | 1,214,324 |
Available-for-sale MBS, Gross Unrealized Gain |  | 2,914 |  |  | 2,832 |
Available-for-sale MBS, Gross Unrealized Loss |  | (10,343) |  |  | (15,951) |
Available-for-sale MBS, Fair Value |  | $ 1,074,679 |  |  | $ 1,201,205 |
Available-for-sale MBS, Weighted Average Coupon | [1] | 3.04% |  |  | 3.05% |
Available-for-sale MBS, Sale Proceeds |  | $ 57,164 |  | 43,890 |  |
Available-for-sale MBS, Gross Realized Losses |  | (1,708) |  | (2,713) |  |
Agency MBS | CMBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance |  | 1,243,516 |  |  | $ 1,152,586 |
Available-for-sale MBS, Unamortized Premium (Discount) |  | 13,814 |  |  | 13,868 |
Available-for-sale MBS, Amortized Cost |  | 1,257,330 |  |  | 1,166,454 |
Available-for-sale MBS, Gross Unrealized Gain |  | 5,435 |  |  | 6,209 |
Available-for-sale MBS, Gross Unrealized Loss |  | (24,387) |  |  | (28,108) |
Available-for-sale MBS, Fair Value |  | $ 1,238,378 |  |  | $ 1,144,555 |
Available-for-sale MBS, Weighted Average Coupon | [1] | 3.10% |  |  | 3.12% |
Agency MBS | CMBS IO |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance |  | $ 0 | [2] |  | $ 0 | [3]
Available-for-sale MBS, Unamortized Premium (Discount) |  | 407,346 |  |  | 411,737 |
Available-for-sale MBS, Amortized Cost |  | 407,346 |  |  | 411,737 |
Available-for-sale MBS, Gross Unrealized Gain |  | 5,822 |  |  | 3,523 |
Available-for-sale MBS, Gross Unrealized Loss |  | (627) |  |  | (3,362) |
Available-for-sale MBS, Fair Value |  | $ 412,541 |  |  | $ 411,898 |
Available-for-sale MBS, Weighted Average Coupon | [1] | 0.78% |  |  | 0.67% |
Notional balance for interest only securities |  | $ 13,680,888 |  |  | $ 13,106,912 |
Non-Agency MBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Fair Value |  | 65,013 |  |  | 205,484 |
Available-for-sale MBS, Continuous Unrealized Loss Position for less than 12 months, Accumulated Loss |  | $ (379) |  |  | $ (2,773) |
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for less than 12 months |  | 13 |  |  | 48 |
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Fair Value |  | $ 38,726 |  |  | $ 81,660 |
Available-for-sale MBS, Continuous Unrealized Loss Position for 12 months or longer, Accumulated Loss |  | $ (658) |  |  | $ (2,332) |
Available-for-sale MBS, Number of Securities in Continuous Unrealized Loss Position for 12 months or longer |  | 17 |  |  | 26 |
Non-Agency MBS | RMBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance |  | $ 26,442 |  |  | $ 33,572 |
Available-for-sale MBS, Unamortized Premium (Discount) |  | (10) |  |  | (24) |
Available-for-sale MBS, Amortized Cost |  | 26,432 |  |  | 33,548 |
Available-for-sale MBS, Gross Unrealized Gain |  | 94 |  |  | 64 |
Available-for-sale MBS, Gross Unrealized Loss |  | (36) |  |  | (50) |
Available-for-sale MBS, Fair Value |  | $ 26,490 |  |  | $ 33,562 |
Available-for-sale MBS, Weighted Average Coupon | [1] | 3.85% |  |  | 3.58% |
Non-Agency MBS | CMBS |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance |  | $ 78,927 |  |  | $ 79,467 |
Available-for-sale MBS, Unamortized Premium (Discount) |  | (6,279) |  |  | (6,718) |
Available-for-sale MBS, Amortized Cost |  | 72,648 |  |  | 72,749 |
Available-for-sale MBS, Gross Unrealized Gain |  | 5,155 |  |  | 5,467 |
Available-for-sale MBS, Gross Unrealized Loss |  | 0 |  |  | 0 |
Available-for-sale MBS, Fair Value |  | $ 77,803 |  |  | $ 78,216 |
Available-for-sale MBS, Weighted Average Coupon | [1] | 4.71% |  |  | 4.72% |
Non-Agency MBS | CMBS IO |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale MBS, Par Balance | [2] | $ 0 |  |  |  |
Available-for-sale MBS, Unamortized Premium (Discount) |  | 353,737 |  |  | $ 346,155 |
Available-for-sale MBS, Amortized Cost |  | 353,737 |  |  | 346,155 |
Available-for-sale MBS, Gross Unrealized Gain |  | 4,121 |  |  | 1,548 |
Available-for-sale MBS, Gross Unrealized Loss |  | (1,000) |  |  | (5,055) |
Available-for-sale MBS, Fair Value |  | $ 356,858 |  |  | $ 342,648 |
Available-for-sale MBS, Weighted Average Coupon | [1] | 0.71% |  |  | 0.61% |
Notional balance for interest only securities |  | $ 11,172,716 |  |  | $ 10,884,964 |
Available-for-sale MBS, Sale Proceeds |  |  |  | 33,640 |  |
Available-for-sale MBS, Gross Realized Losses |  |  |  | $ (1,228) |  |
[1] | The weighted average coupon ("WAC") is the gross interest rate of the pool of mortgages underlying 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 $13,680,888 and $11,172,716, respectively, as of March 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.

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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