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DEBT (Loan Obligations of the Consolidated CLOs) (Details) - Consolidated Funds - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
DEBT    
Fair Value of Loan Obligations $ 4,476,643,000 $ 3,031,112,000
Fixed income-collateralized loan obligations    
DEBT    
Loan Obligations 4,572,350,000 3,123,825,000
Fair Value of Loan Obligations 4,476,643,000 3,031,112,000
Senior secured notes | Fixed income-collateralized loan obligations    
DEBT    
Loan Obligations 4,298,009,000 2,839,779,000
Fair Value of Loan Obligations $ 4,279,766,000 $ 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 $ 4,300,000,000.0  
Weighted average interest rate (as a percent) 4.25%  
Subordinated notes / preferred shares | Fixed income-collateralized loan obligations    
DEBT    
Loan Obligations $ 274,341,000 $ 284,046,000
Fair Value of Loan Obligations $ 196,877,000 $ 189,672,000
Weighted Average Remaining Maturity In Years 10 years 18 days 9 years 11 months 19 days
Debt instrument face amount $ 274,300,000.0