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FAIR VALUE MEASUREMENT AND FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2014
Jun. 30, 2015
Quantitative information    
Available-for-sale investment securities $ 2,626,365 $ 2,982,146
Derivative liabilities (56,493) (54,746)
Corporate debt securities | Non-investment grade    
Quantitative information    
Available-for-sale investment securities [1] 14,681 10,025
Fair Value, Measurements, Recurring    
Quantitative information    
Available-for-sale investment securities 2,626,365 2,982,146
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Quantitative information    
Available-for-sale investment securities 6,528  
Fair Value, Measurements, Recurring | Embedded derivative liabilities    
Quantitative information    
Derivative liabilities (3,392)  
Fair Value, Measurements, Recurring | Embedded derivative liabilities | Significant Unobservable Inputs (Level 3)    
Quantitative information    
Derivative liabilities (3,392)  
Fair Value, Measurements, Recurring | Embedded derivative liabilities | Discounted cash flow | Significant Unobservable Inputs (Level 3)    
Quantitative information    
Derivative liabilities $ (3,392)  
Fair Value, Measurements, Recurring | Embedded derivative liabilities | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Minimum    
Quantitative information    
Credit risk 0.12%  
Fair Value, Measurements, Recurring | Embedded derivative liabilities | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Maximum    
Quantitative information    
Credit risk 0.14%  
Fair Value, Measurements, Recurring | Embedded derivative liabilities | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average    
Quantitative information    
Credit risk 0.13%  
Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade    
Quantitative information    
Available-for-sale investment securities $ 14,681 $ 10,025
Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Significant Unobservable Inputs (Level 3)    
Quantitative information    
Available-for-sale investment securities 6,528  
Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Discounted cash flow | Significant Unobservable Inputs (Level 3)    
Quantitative information    
Available-for-sale investment securities $ 6,528  
Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Minimum    
Quantitative information    
Constant prepayment rate 0.00%  
Constant default rate 0.75%  
Discount margin 4.50%  
Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Maximum    
Quantitative information    
Constant prepayment rate 1.00%  
Constant default rate 1.20%  
Discount margin 7.50%  
Fair Value, Measurements, Recurring | Corporate debt securities | Non-investment grade | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average    
Quantitative information    
Constant prepayment rate 0.73%  
Constant default rate 0.87%  
Loss severity 85.00%  
Discount margin 6.94%  
[1] Available-for-sale investment securities rated BBB- or higher by S&P or Baa3 or higher by Moody's are considered investment grade. Conversely, available-for-sale investment securities rated lower than BBB- by S&P or lower than Baa3 by Moody's are considered non-investment grade.