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Other Assets - Investment Revenues (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]      
Net realized and unrealized gains (losses) on investments in merchant banking funds $ (210) $ 236 $ (6,372)
Interest income 942 1,043 1,154
Total investment revenues (losses) $ 732 $ 1,279 $ (5,218)