Acquisitions Fauchier Acquisition - Purchase Price Allocation (Details) - Fauchier [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2013	Sep. 30, 2015	Mar. 31, 2015	Mar. 13, 2013
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 63,433
Business Combination, Contingent Consideration, Liability		$ 5,075	$ 27,117	$ 21,566
Business Combination, Consideration Transferred	$ 84,999
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents				8,156
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables				12,174
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				2,865
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other				(16,667)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent				(15,638)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				56,016
Goodwill				28,983
Other Fund Management Contracts [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets				$ 65,126