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DEBT (Loan Obligations of the Consolidated CLOs) (Details) - Consolidated Funds - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
DEBT    
Fair Value of Loan Obligations $ 3,093,598,000 $ 3,031,112,000
Fixed income-collateralized loan obligations    
DEBT    
Loan Obligations 3,171,308,000 3,123,825,000
Fair Value of Loan Obligations 3,093,598,000 3,031,112,000
Senior secured notes | Fixed income-collateralized loan obligations    
DEBT    
Loan Obligations 2,914,099,000 2,839,779,000
Fair Value of Loan Obligations $ 2,905,347,000 $ 2,841,440,000
Weighted Average Remaining Maturity In Years 9 years 9 months 10 days 9 years 8 months 4 days
Debt instrument face amount $ 3,200,000,000.0  
Weighted average interest rate (as a percent) 3.72%  
Subordinated notes / preferred shares | Fixed income-collateralized loan obligations    
DEBT    
Loan Obligations $ 257,209,000 $ 284,046,000
Fair Value of Loan Obligations $ 188,251,000 $ 189,672,000
Weighted Average Remaining Maturity In Years 10 years 18 days 9 years 11 months 19 days
Debt instrument face amount $ 257,200,000.0