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Acquisitions Clarion Partners Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2014
Sep. 30, 2016
Apr. 13, 2016
Clarion Partners [Member]          
Business Acquisition [Line Items]          
Assets Under Management         $ 41,500,000
Noncontrolling Interest, Ownership Percentage by Parent         82.00%
Payments to Acquire Businesses, Gross   $ 631,476   $ 631,476 [1]  
Business Combination, Consideration Transferred, Other   36,772      
Co-Investments   16,210      
Business Combination, Acquisition Related Costs $ 358     10,741  
Clarion Management Team [Member]          
Business Acquisition [Line Items]          
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners         18.00%
Clarion Partners [Member]          
Business Acquisition [Line Items]          
Revenues 84,082     140,773  
Management Equity Plan [Member] | Clarion Partners [Member]          
Business Acquisition [Line Items]          
Deferred Compensation Arrangement with Individual, Compensation Expense   $ 15,200   $ 15,200  
Fund management contracts [Member] | Clarion Partners [Member]          
Business Acquisition [Line Items]          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     10 years    
Deferred Income Tax Charge [Member] | Clarion Partners [Member]          
Business Acquisition [Line Items]          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustments Related to Previous Period $ 14,044        
[1] (1)Subject to measurement period adjustments, including for amounts ultimately realized