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Other Assets - Carrying Value of Investments in Merchant Banking Funds (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 3,590 $ 4,295
Investments in merchant banking funds 1,202 1,689
Rent deposits 1,771 1,517
Other tangible assets 1,235 540
Intangible assets 100 300
Total other assets $ 7,898 $ 8,341