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Acquisitions Clarion Partners Acquisition (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Mar. 31, 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      
Business Combination, Consideration Transferred, Other 36,772      
Co-Investments 16,210      
EnTrust Capital [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Transaction Costs 299 $ 7,031    
Revenues 26,540 45,266    
Clarion Management Team [Member]        
Business Acquisition [Line Items]        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       18.00%
Clarion Partners [Member]        
Business Acquisition [Line Items]        
Business Acquisition, Transaction Costs 358 10,741    
Revenues 84,082 140,773    
Management Equity Plan [Member] | Clarion Partners [Member]        
Business Acquisition [Line Items]        
Deferred Compensation Arrangement with Individual, Allocated Share-based 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