Investments in Merchant Banking Funds - Investment Revenues (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Principal Transaction Revenue [Line Items]
Net realized and unrealized gains (losses) on investments in merchant banking funds			$ (35)	$ (122)
Interest income	$ 256	$ 262	519	493
Total investment revenues	220	380	532	371
Merchant Banking Funds
Principal Transaction Revenue [Line Items]
Net realized and unrealized gains (losses) on investments in merchant banking funds	$ (36)	$ 118	$ 13	$ (122)

- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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