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Other Assets - Carrying Value of Investments in Merchant Banking Funds (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 3,839 $ 4,295
Investments in merchant banking funds 1,604 1,689
Rent deposits 1,753 1,517
Other tangible assets 604 540
Intangible assets 150 300
Other Assets $ 7,950 $ 8,341