Variable Interest Entities and Consolidation of Investment Vehicles Information about Investments in CIV's (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2015	Mar. 31, 2016 USD ($)
Variable Interest Entity
Employee Owned Funds	1	14	14
Variable Interest Entity, Number of Collateralized Securites Vehicles		3
Variable Interest Entity, Primary Beneficiary, Number of Collateralized Securites Vehicles			0
Number of Sponsored Investment Fund Vie	6		1
Consolidated Investment Vehicles [Member]
Variable Interest Entity
Assets, Fair Value Disclosure	$ 87,860
Consolidated Investment Vehicles [Member] | Proprietary Funds [Member]
Variable Interest Entity
Assets, Fair Value Disclosure	$ 31,779		$ 13,641