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Other Assets - Investment Revenues (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Principal Transaction Revenue [Line Items]    
Net realized and unrealized gains (losses) on investments in merchant banking funds $ (23) $ 2
Interest income 252 263
Total investment revenues 229 312
Merchant Banking Funds    
Principal Transaction Revenue [Line Items]    
Net realized and unrealized gains (losses) on investments in merchant banking funds $ (23) $ 49