Investments - Investment Revenues (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Principal Transaction Revenue [Line Items]
Net realized and unrealized gains (losses)			$ (1,612)	$ 100
Interest income	340	590	793	1,299
Total investment revenues	(2,440)	(10,010)	(672)	1,594
Iridium [Member]
Principal Transaction Revenue [Line Items]
Net realized and unrealized gains (losses)	(3,223)	(10,826)	1,347	(1,153)
Merchant Banking Funds
Principal Transaction Revenue [Line Items]
Net realized and unrealized gains (losses)	394	161	(2,959)	1,253
Deferred gain on sale of certain merchant banking assets	$ 49	$ 65	$ 147	$ 195

- 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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