CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Ownership interests in and advances, to partner companies and funds, fair value	$ 19,363	$ 20,972
Preferred stock, par value	$ 0.10	$ 0.10
Preferred stock, shares authorized	1,000	1,000
Common stock, par value	$ 0.10	$ 0.10
Common stock, shares authorized	83,333	83,333
Common stock, shares issued	20,977	20,968
Common stock, shares outstanding	20,977	20,968