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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 4)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
$ / barrel
Mar. 31, 2015
Dec. 31, 2015
USD ($)
$ / shares
$ / barrel
Minimum      
Valuation techniques used for assets, measured at fair value      
Weight ascribed to each valuation technique 0.00% 0.00%  
Maximum      
Valuation techniques used for assets, measured at fair value      
Weight ascribed to each valuation technique 100.00% 100.00%  
Significant Unobservable Inputs (Level 3) | Corporate Debt Securities      
Valuation techniques used for assets, measured at fair value      
Assets, fair value $ 150,068   $ 194,986
Significant Unobservable Inputs (Level 3) | Residential Mortgage- Backed Securities      
Valuation techniques used for assets, measured at fair value      
Assets, fair value 47,714   49,621
Significant Unobservable Inputs (Level 3) | Corporate loans, at estimated fair value      
Valuation techniques used for assets, measured at fair value      
Assets, fair value 296,982   298,734
Significant Unobservable Inputs (Level 3) | Equity Investments, at Estimated Fair Value      
Valuation techniques used for assets, measured at fair value      
Assets, fair value $ 138,563   $ 146,648
Significant Unobservable Inputs (Level 3) | Equity Investments, at Estimated Fair Value | Minimum      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount 5.00%   5.00%
Significant Unobservable Inputs (Level 3) | Interests in Joint Ventures and Partnerships      
Valuation techniques used for assets, measured at fair value      
Assets, fair value $ 748,329   $ 888,408
Significant Unobservable Inputs (Level 3) | Foreign Exchange Options, Net      
Valuation techniques used for assets, measured at fair value      
Assets, fair value 1,841   2,887
Significant Unobservable Inputs (Level 3) | Options      
Valuation techniques used for assets, measured at fair value      
Assets, fair value $ 498   $ 95
Significant Unobservable Inputs (Level 3) | Yield analysis | Corporate Debt Securities | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Yield 12.00%   23.00%
Net leverage 9   10
EBITDA multiple 8   7
Discount margin 10.50%   7.50%
Significant Unobservable Inputs (Level 3) | Yield analysis | Corporate Debt Securities | Minimum      
Valuation techniques used for assets, measured at fair value      
Yield 7.00%   6.00%
Net leverage 9   10
EBITDA multiple 7   7
Discount margin 10.50%   7.50%
Significant Unobservable Inputs (Level 3) | Yield analysis | Corporate Debt Securities | Maximum      
Valuation techniques used for assets, measured at fair value      
Yield 13.00%   31.00%
Net leverage 10   12
EBITDA multiple 9   10
Discount margin 10.50%   7.50%
Significant Unobservable Inputs (Level 3) | Yield analysis | Corporate loans, at estimated fair value | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Yield 13.00%   11.00%
Net leverage 8   7
EBITDA multiple 9   9
Significant Unobservable Inputs (Level 3) | Yield analysis | Corporate loans, at estimated fair value | Minimum      
Valuation techniques used for assets, measured at fair value      
Yield 4.00%   3.00%
Net leverage 1   1
EBITDA multiple 6   6
Significant Unobservable Inputs (Level 3) | Yield analysis | Corporate loans, at estimated fair value | Maximum      
Valuation techniques used for assets, measured at fair value      
Yield 24.00%   18.00%
Net leverage 14   19
EBITDA multiple 13   15
Significant Unobservable Inputs (Level 3) | Yield analysis | Interests in Joint Ventures and Partnerships      
Valuation techniques used for assets, measured at fair value      
Assets, fair value $ 18,100   $ 17,500
Significant Unobservable Inputs (Level 3) | Yield analysis | Interests in Joint Ventures and Partnerships | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Yield 14.00%   16.00%
Net leverage 2   2
EBITDA multiple 6   8
Significant Unobservable Inputs (Level 3) | Yield analysis | Interests in Joint Ventures and Partnerships | Minimum      
Valuation techniques used for assets, measured at fair value      
Yield 14.00%   16.00%
Net leverage 2   2
EBITDA multiple 6   8
Significant Unobservable Inputs (Level 3) | Yield analysis | Interests in Joint Ventures and Partnerships | Maximum      
Valuation techniques used for assets, measured at fair value      
Yield 14.00%   16.00%
Net leverage 2   2
EBITDA multiple 6   8
Significant Unobservable Inputs (Level 3) | Option pricing model | Foreign Exchange Options, Net | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Forward and Spot Rates, Assets 12,000    
Significant Unobservable Inputs (Level 3) | Option pricing model | Foreign Exchange Options, Net | Minimum      
Valuation techniques used for assets, measured at fair value      
Forward and Spot Rates, Assets 6    
Significant Unobservable Inputs (Level 3) | Option pricing model | Foreign Exchange Options, Net | Maximum      
Valuation techniques used for assets, measured at fair value      
Forward and Spot Rates, Assets 13,500    
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Residential Mortgage- Backed Securities | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Probability of default 1.00%   1.00%
Loss severity 40.00%   40.00%
Constant prepayment rate 15.00%   15.00%
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Residential Mortgage- Backed Securities | Minimum      
Valuation techniques used for assets, measured at fair value      
Probability of default 0.00%   0.00%
Loss severity 35.00%   35.00%
Constant prepayment rate 12.00%   12.00%
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Residential Mortgage- Backed Securities | Maximum      
Valuation techniques used for assets, measured at fair value      
Probability of default 3.00%   3.00%
Loss severity 45.00%   45.00%
Constant prepayment rate 18.00%   18.00%
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Equity Investments, at Estimated Fair Value | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Forward EBITDA multiple 9.00%   9.00%
LTM EBITDA exit multiple 9   8
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Equity Investments, at Estimated Fair Value | Minimum      
Valuation techniques used for assets, measured at fair value      
Forward EBITDA multiple 7.00%   7.00%
LTM EBITDA exit multiple 3   0
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Equity Investments, at Estimated Fair Value | Maximum      
Valuation techniques used for assets, measured at fair value      
Forward EBITDA multiple 14.00%   14.00%
LTM EBITDA exit multiple 11   9
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Interests in Joint Ventures and Partnerships      
Valuation techniques used for assets, measured at fair value      
Assets, fair value $ 162,000   $ 164,400
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Interests in Joint Ventures and Partnerships | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Forward EBITDA multiple 10.00%   8.00%
Average Price Per B O E | $ / barrel 18.80   20.61
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Interests in Joint Ventures and Partnerships | Minimum      
Valuation techniques used for assets, measured at fair value      
Forward EBITDA multiple 7.00%   6.00%
Average Price Per B O E | $ / barrel 12.56   14.33
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Interests in Joint Ventures and Partnerships | Maximum      
Valuation techniques used for assets, measured at fair value      
Forward EBITDA multiple 24.00%   20.00%
Average Price Per B O E | $ / barrel 21.70   23.22
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Options | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Forward EBITDA multiple 15.00%   14.00%
LTM EBITDA exit multiple 6   8
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Options | Minimum      
Valuation techniques used for assets, measured at fair value      
Forward EBITDA multiple 15.00%   14.00%
LTM EBITDA exit multiple 6   8
Significant Unobservable Inputs (Level 3) | Discounted cash flows | Options | Maximum      
Valuation techniques used for assets, measured at fair value      
Forward EBITDA multiple 15.00%   14.00%
LTM EBITDA exit multiple 6   8
Significant Unobservable Inputs (Level 3) | Broker quotes | Equity Investments, at Estimated Fair Value      
Valuation techniques used for assets, measured at fair value      
Assets, fair value     $ 6,400
Significant Unobservable Inputs (Level 3) | Broker quotes | Equity Investments, at Estimated Fair Value | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Offered quotes (in dollars per share) | $ / shares     $ 4.00
Significant Unobservable Inputs (Level 3) | Broker quotes | Equity Investments, at Estimated Fair Value | Minimum      
Valuation techniques used for assets, measured at fair value      
Offered quotes (in dollars per share) | $ / shares     0
Significant Unobservable Inputs (Level 3) | Broker quotes | Equity Investments, at Estimated Fair Value | Maximum      
Valuation techniques used for assets, measured at fair value      
Offered quotes (in dollars per share) | $ / shares     $ 5
Significant Unobservable Inputs (Level 3) | Market comparables | Corporate Debt Securities | Weighted Average      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 9    
Forward EBITDA multiple 12    
Significant Unobservable Inputs (Level 3) | Market comparables | Corporate Debt Securities | Minimum      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 9    
Forward EBITDA multiple 12    
Significant Unobservable Inputs (Level 3) | Market comparables | Corporate Debt Securities | Maximum      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 9    
Forward EBITDA multiple 12    
Significant Unobservable Inputs (Level 3) | Market comparables | Equity Investments, at Estimated Fair Value      
Valuation techniques used for assets, measured at fair value      
Assets, fair value $ 14,200   $ 11,300
Significant Unobservable Inputs (Level 3) | Market comparables | Equity Investments, at Estimated Fair Value | Weighted Average      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 9   8
Forward EBITDA multiple 8   8
Significant Unobservable Inputs (Level 3) | Market comparables | Equity Investments, at Estimated Fair Value | Minimum      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 4   4
Forward EBITDA multiple 4   3
Significant Unobservable Inputs (Level 3) | Market comparables | Equity Investments, at Estimated Fair Value | Maximum      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 15   13
Forward EBITDA multiple 12   11
Significant Unobservable Inputs (Level 3) | Market comparables | Interests in Joint Ventures and Partnerships      
Valuation techniques used for assets, measured at fair value      
Assets, fair value $ 44,600   $ 98,900
Significant Unobservable Inputs (Level 3) | Market comparables | Interests in Joint Ventures and Partnerships | Weighted Average      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 5   5
Control Premium 7.00%    
Significant Unobservable Inputs (Level 3) | Market comparables | Interests in Joint Ventures and Partnerships | Minimum      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 1   1
Control Premium 4.00%    
Significant Unobservable Inputs (Level 3) | Market comparables | Interests in Joint Ventures and Partnerships | Maximum      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 9   9
Control Premium 11.00%    
Significant Unobservable Inputs (Level 3) | Market comparables | Options | Weighted Average      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 7   9
Forward EBITDA multiple 7   8
Significant Unobservable Inputs (Level 3) | Market comparables | Options | Minimum      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 7   9
Forward EBITDA multiple 7   8
Significant Unobservable Inputs (Level 3) | Market comparables | Options | Maximum      
Valuation techniques used for assets, measured at fair value      
LTM EBITDA multiple 7   9
Forward EBITDA multiple 7   8
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Equity Investments, at Estimated Fair Value | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount 11.00%    
Weight ascribed to market comparables 59.00%    
Weight ascribed to discounted cash flows 41.00%    
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Equity Investments, at Estimated Fair Value | Minimum      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount 0.00%    
Weight ascribed to market comparables 0.00%    
Weight ascribed to discounted cash flows 0.00%    
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Equity Investments, at Estimated Fair Value | Maximum      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount 15.00%    
Weight ascribed to market comparables 100.00%    
Weight ascribed to discounted cash flows 50.00%    
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Interests in Joint Ventures and Partnerships | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Weight ascribed to market comparables 34.00%   43.00%
Weight ascribed to discounted cash flows 66.00%   57.00%
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Interests in Joint Ventures and Partnerships | Minimum      
Valuation techniques used for assets, measured at fair value      
Weight ascribed to market comparables 0.00%   0.00%
Weight ascribed to discounted cash flows 0.00%   0.00%
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Interests in Joint Ventures and Partnerships | Maximum      
Valuation techniques used for assets, measured at fair value      
Weight ascribed to market comparables 100.00%   100.00%
Weight ascribed to discounted cash flows 100.00%   100.00%
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Options      
Valuation techniques used for assets, measured at fair value      
Weight ascribed to market comparables 50.00%   50.00%
Weight ascribed to discounted cash flows 50.00%   50.00%
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Options | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount 10.00%   10.00%
Weight ascribed to market comparables 50.00%   50.00%
Weight ascribed to discounted cash flows 50.00%   50.00%
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Options | Minimum      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount 10.00%   10.00%
Weight ascribed to market comparables 50.00%   50.00%
Weight ascribed to discounted cash flows 50.00%   50.00%
Significant Unobservable Inputs (Level 3) | Inputs to both market comparables and discounted cash flow | Options | Maximum      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount 10.00%   10.00%
Weight ascribed to market comparables 50.00%   50.00%
Weight ascribed to discounted cash flows 50.00%   50.00%
Significant Unobservable Inputs (Level 3) | Inputs to market comparables, discounted cash flow and broker quotes | Equity Investments, at Estimated Fair Value | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount     11.00%
Weight ascribed to market comparables     52.00%
Weight ascribed to discounted cash flows     42.00%
Weight ascribed to broker quotes     6.00%
Significant Unobservable Inputs (Level 3) | Inputs to market comparables, discounted cash flow and broker quotes | Equity Investments, at Estimated Fair Value | Minimum      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount     0.00%
Weight ascribed to market comparables     0.00%
Weight ascribed to discounted cash flows     0.00%
Weight ascribed to broker quotes     0.00%
Significant Unobservable Inputs (Level 3) | Inputs to market comparables, discounted cash flow and broker quotes | Equity Investments, at Estimated Fair Value | Maximum      
Valuation techniques used for assets, measured at fair value      
Illiquidity discount     15.00%
Weight ascribed to market comparables     100.00%
Weight ascribed to discounted cash flows     100.00%
Weight ascribed to broker quotes     100.00%
Crude Oil      
Valuation techniques used for assets, measured at fair value      
Percentage of share in total revenue 26.00%   25.00%
Natural Gas      
Valuation techniques used for assets, measured at fair value      
Percentage of share in total revenue 74.00%   75.00%
Natural Resources      
Valuation techniques used for assets, measured at fair value      
Assets, fair value $ 92,600   $ 114,100
Foreign Exchange Options, Net | Significant Unobservable Inputs (Level 3) | Option pricing model | Weighted Average      
Valuation techniques used for assets, measured at fair value      
Forward and Spot Rates, Assets     11,500
Foreign Exchange Options, Net | Significant Unobservable Inputs (Level 3) | Option pricing model | Minimum      
Valuation techniques used for assets, measured at fair value      
Forward and Spot Rates, Assets     6
Foreign Exchange Options, Net | Significant Unobservable Inputs (Level 3) | Option pricing model | Maximum      
Valuation techniques used for assets, measured at fair value      
Forward and Spot Rates, Assets     14,000