FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Securities Valuation Methodology and Results (Details) $ in Thousands |
9 Months Ended | |||||||||||||||||||||
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Sep. 30, 2016
USD ($)
source
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Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Outstanding Face Amount | $ 8,027,852 | |||||||||||||||||||||
Amortized Cost Basis | 4,884,599 | |||||||||||||||||||||
Total Fair Value | $ 4,991,242 | |||||||||||||||||||||
Number of broker quotation sources | source | 2 | |||||||||||||||||||||
Percent of securities | 67.58197% | |||||||||||||||||||||
Multiple Quotes [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Total Fair Value | $ 4,496,719 | [1] | ||||||||||||||||||||
Single Quote [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Total Fair Value | 494,523 | [2] | ||||||||||||||||||||
Single Quote [Member] | Seller [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Total Fair Value | 462,700 | |||||||||||||||||||||
Agency RMBS [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Outstanding Face Amount | 1,356,580 | [3],[4] | ||||||||||||||||||||
Amortized Cost Basis | 1,437,777 | [3],[4] | ||||||||||||||||||||
Agency RMBS [Member] | Level 2 [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Total Fair Value | 1,434,308 | |||||||||||||||||||||
Agency RMBS [Member] | Level 2 [Member] | Multiple Quotes [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Total Fair Value | 1,434,308 | [1] | ||||||||||||||||||||
Agency RMBS [Member] | Level 2 [Member] | Single Quote [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Total Fair Value | 0 | [2] | ||||||||||||||||||||
Non-Agency RMBS [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Outstanding Face Amount | 6,671,272 | [5],[6],[7] | ||||||||||||||||||||
Amortized Cost Basis | 3,446,822 | [5],[6],[7] | ||||||||||||||||||||
Fair Value | $ 2,403,846 | |||||||||||||||||||||
Non-Agency RMBS [Member] | Minimum [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Discount Rate | 1.57% | |||||||||||||||||||||
Prepayment Rate | 0.00% | [8] | ||||||||||||||||||||
Delinquency | 0.01% | [9] | ||||||||||||||||||||
Loss Severity | 5.00% | [10] | ||||||||||||||||||||
Non-Agency RMBS [Member] | Maximum [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Discount Rate | 32.75% | |||||||||||||||||||||
Prepayment Rate | 20.00% | [8] | ||||||||||||||||||||
Delinquency | 12.00% | [9] | ||||||||||||||||||||
Loss Severity | 100.00% | [10] | ||||||||||||||||||||
Non-Agency RMBS [Member] | Level 3 [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Total Fair Value | $ 3,556,934 | [5] | ||||||||||||||||||||
Non-Agency RMBS [Member] | Level 3 [Member] | Multiple Quotes [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Total Fair Value | 3,062,411 | [1],[5] | ||||||||||||||||||||
Non-Agency RMBS [Member] | Level 3 [Member] | Single Quote [Member] | ||||||||||||||||||||||
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] | ||||||||||||||||||||||
Total Fair Value | $ 494,523 | [2],[5] | ||||||||||||||||||||
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