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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 4) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2015
Quantitative information |  |
Available-for-sale investment securities, at fair value | $ 2,626,617 | $ 2,952,277
Derivative liabilities | (56,493) | (98,748)
Corporate debt securities | Non-investment grade |  |
Quantitative information |  |
Available-for-sale investment securities, at fair value | 14,681 | 10,524
Fair Value, Measurements, Recurring |  |
Quantitative information |  |
Available-for-sale investment securities, at fair value | 2,626,617 | 2,952,277
Fair Value, Measurements, Recurring | Embedded derivative liabilities |  |
Quantitative information |  |
Derivative liabilities | (3,392) |
Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade |  |
Quantitative information |  |
Available-for-sale investment securities, at fair value | 14,681 | $ 10,524
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Quantitative information |  |
Available-for-sale investment securities, at fair value | 6,528 |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Embedded derivative liabilities |  |
Quantitative information |  |
Derivative liabilities | (3,392) |
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade |  |
Quantitative information |  |
Available-for-sale investment securities, at fair value | 6,528 |
Fair Value, Measurements, Recurring | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Embedded derivative liabilities |  |
Quantitative information |  |
Derivative liabilities | $ (3,392) |
Fair Value, Measurements, Recurring | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Embedded derivative liabilities | Minimum |  |
Quantitative information |  |
Credit risk | 0.12% |
Fair Value, Measurements, Recurring | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Embedded derivative liabilities | Maximum |  |
Quantitative information |  |
Credit risk | 0.14% |
Fair Value, Measurements, Recurring | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Embedded derivative liabilities | Weighted Average |  |
Quantitative information |  |
Credit risk | 0.13% |
Fair Value, Measurements, Recurring | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade |  |
Quantitative information |  |
Available-for-sale investment securities, at fair value | $ 6,528 |
Fair Value, Measurements, Recurring | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade | Minimum |  |
Quantitative information |  |
Constant prepayment rate | 0.00% |
Constant default rate | 0.75% |
Discount margin | 4.50% |
Fair Value, Measurements, Recurring | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade | Maximum |  |
Quantitative information |  |
Constant prepayment rate | 1.00% |
Constant default rate | 1.20% |
Discount margin | 7.50% |
Fair Value, Measurements, Recurring | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade | Weighted Average |  |
Quantitative information |  |
Constant prepayment rate | 0.73% |
Constant default rate | 0.87% |
Loss severity | 85.00% |
Discount margin | 6.94% |

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