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Segment Reporting - Reportable Segment Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Segment Reporting, Asset Reconciling Item [Line Items]    
Reportable segment assets $ 1,514,528 $ 2,024,683
Capital Markets    
Segment Reporting, Asset Reconciling Item [Line Items]    
Reportable segment assets 1,435,481 1,933,050
Asset Management    
Segment Reporting, Asset Reconciling Item [Line Items]    
Reportable segment assets $ 79,047 $ 91,633