Segment and Geographic Information (Revenue By Geographic Area) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 55,750	$ 57,517	$ 95,240
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	44,991	44,043	78,597
Europe [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	10,636	11,178	16,643
Asia [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	123	2,296
Institutional Financial Markets, Inc. [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Revenues	$ 1,174	$ (11,502)	$ 2,666