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 |