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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Quantitative Information (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 | Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Carrying Value | $ 2,415,382 | $ 2,815,565
CMBS | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Carrying Value | $ 1,985,195 | $ 2,305,409
CMBS | Minimum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | (23.70%) | (13.06%)
CMBS | Weighted Average | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 1.51% | 2.36%
Duration | 4 years 2 months 23 days | 4 years 8 months 4 days
CMBS | Maximum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 5.27% | 5.49%
Duration | 8 years 1 month 9 days | 8 years 3 months 3 days
CMBS interest-only | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Carrying Value | $ 356,928 | $ 378,335
CMBS interest-only | Minimum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 2.06% | (27.49%)
Duration | 1 month 13 days | 5 months 26 days
Prepayment speed | 100.00% | 100.00%
CMBS interest-only | Weighted Average | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 3.65% | (4.93%)
Duration | 3 years 5 months 1 day | 3 years 6 months
Prepayment speed | 100.00% | 100.00%
CMBS interest-only | Maximum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 14.84% | 23.32%
Duration | 4 years 4 months 9 days | 4 years 8 months 23 days
Prepayment speed | 100.00% | 100.00%
GNMA interest-only | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Carrying Value | $ 28,603 | $ 66,642
GNMA interest-only | Minimum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | (3.64%) | (0.85%)
Duration | 5 months 19 days |
Prepayment speed | 5.00% | 5.00%
GNMA interest-only | Weighted Average | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 4.82% | 5.90%
Duration | 5 years 5 months 23 days | 4 years 6 months
Prepayment speed | 14.43% | 14.99%
GNMA interest-only | Maximum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 82.81% | 54.24%
Duration | 34 years 6 months 7 days | 6 years 3 months 10 days
Prepayment speed | 35.00% | 35.00%
GN construction securities | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Carrying Value | $ 27,849 | $ 28,406
GN construction securities | Minimum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 0.32% | 0.33%
Duration | 1 year 10 months 27 days | 1 year 11 months 12 days
GN construction securities | Weighted Average | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 3.62% | 3.54%
Duration | 9 years 5 months 15 days | 9 years 5 months 1 day
GN construction securities | Maximum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 3.67% | 3.70%
Duration | 9 years 6 months 25 days | 10 years 7 days
GN permanent securities | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Carrying Value | $ 16,807 | $ 36,773
GN permanent securities | Minimum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 2.53% | 0.00%
Duration | 1 year 10 months 6 days | 14 days
GN permanent securities | Weighted Average | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 3.76% | 1.28%
Duration | 6 years 1 month 2 days | 1 year 3 months 25 days
GN permanent securities | Maximum | Discounted Cash Flow | Level 3 |  |
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |
Yield | 6.35% | 6.43%
Duration | 9 years 3 months 10 days | 9 years 3 months 7 days

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