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Variable Interest Entities - Consolidated VIEs (Details) - USD ($)
Mar. 31, 2019
Mar. 31, 2018
Variable Interest Entity [Line Items]    
Deferred incentive fee revenue $ 3,704,000 $ 6,245,000
Primary Beneficiary    
Variable Interest Entity [Line Items]    
Total assets of consolidated VIEs 11,648,000 14,704,000
Total liabilities of consolidated VIEs $ 0 $ 0