LOANS (Weighted Average Life of Middle Market Loans, at Amortized Cost) (Details) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Receivables with Imputed Interest [Line Items] | ||
| Net carrying value of loans held for investment | $ 2,160,751 | $ 1,925,980 |
| Middle-market Loans [Member] | ||
| Receivables with Imputed Interest [Line Items] | ||
| Loans held for investment, Less than twelve months, Amortized cost | 14,960 | 0 |
| Loans Held For Investment,Greater than Twelve Month and Less than Sixty Months, Carry Value | 250,709 | 132,353 |
| Loans Held For Investment,Greater than Sixty Months, Carry Value | 109,844 | 117,760 |
| Net carrying value of loans held for investment | $ 375,513 | $ 250,113 |