Derivatives and Hedging Gains and (Losses) of Derivative Instruments (Details) - Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Apr. 16, 2016	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain		$ 13,615	$ 6,400
Derivative Instruments Not Designated as Hedging Instruments, Loss		(12,230)	(4,423)
Derivative, Gain on Derivative		13,615	6,400
Derivative, Loss on Derivative		(12,757)	(5,398)
Interest Rate Swap [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain on Derivative	$ 6,500
Forward Contracts [Member] | Other Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain		10,530	4,842
Derivative Instruments Not Designated as Hedging Instruments, Loss		(7,983)	(1,137)
Forward Contracts [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain		1,334	28
Derivative Instruments Not Designated as Hedging Instruments, Loss		(856)	(595)
Future [Member] | Other Nonoperating Income (Expense) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain		1,751	1,530
Derivative Instruments Not Designated as Hedging Instruments, Loss		(3,391)	(2,691)
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain on Derivative		0	0
Derivative, Loss on Derivative		(527)	0
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Gain on Derivative		0	0
Derivative, Loss on Derivative		$ 0	$ (975)