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Derivatives and Hedging Fair Value of Derivative Assets (Details 1) - Not Designated as Hedging Instrument [Member] - Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Derivative    
Derivative Asset, Fair Value, Gross Asset $ 7,617 $ 3,470
Derivative Asset, Fair Value, Gross Liability (1,884) (928)
Derivative Asset 5,733 2,542
Derivative Asset, Not Subject to Master Netting Arrangement 1,450 176
Derivative Asset, Collateral, Obligation to Return Cash, Offset 3,003 2,878
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 10,186 5,596
Foreign Exchange Forward [Member]    
Derivative    
Derivative Asset, Fair Value, Gross Asset 7,617 3,470
Derivative Asset, Fair Value, Gross Liability (1,884) (928)
Derivative Asset 5,733 2,542
Derivative Asset, Not Subject to Master Netting Arrangement 0 0
Derivative Asset, Collateral, Obligation to Return Cash, Offset 0 0
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement 5,733 2,542
Forward Contracts [Member]    
Derivative    
Derivative Asset, Fair Value, Gross Asset   0
Derivative Asset, Fair Value, Gross Liability   0
Derivative Asset   0
Derivative Asset, Not Subject to Master Netting Arrangement   176
Derivative Asset, Collateral, Obligation to Return Cash, Offset   2,878
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement   $ 3,054
Investments [Member] | Total Return Swap [Member]    
Derivative    
Derivative Asset, Fair Value, Gross Asset 0  
Derivative Asset, Fair Value, Gross Liability 0  
Derivative Asset 0  
Derivative Asset, Not Subject to Master Netting Arrangement 1,450  
Derivative Asset, Collateral, Obligation to Return Cash, Offset 3,003  
Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement $ 4,453