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Other Assets - Components of Other Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Prepaid expenses $ 5,143 $ 2,583
Investments in merchant banking funds 850 1,209
Rent deposits 1,764 1,798
Other tangible assets 368 639
Intangible assets 0 50
Total other assets $ 8,125 $ 6,279