Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 83,187	$ 183,419
Cash held in escrow	6,433	6,434
Marketable securities	158,098	42,411
Restricted cash equivalents	5,137	4,893
Prepaid expenses and other current assets	1,081	785
Total current assets	253,936	237,942
Property and equipment, net	228	295
Ownership interests in and advances to partner companies and funds	114,169	60,256
Loan participations receivable	7,587	0
Available-for-sale securities	5,184	25,447
Long-term marketable securities	16,287	0
Long-term restricted cash equivalents	7,128	11,881
Other	2,117	724
Total Assets	406,636	336,545
Current Liabilities:
Convertible senior debentures - current	0	31,289
Accounts payable	243	493
Accrued compensation and benefits	4,583	4,168
Accrued expenses and other current liabilities	3,690	4,223
Total current liabilities	8,516	40,173
Other long-term liabilities	4,146	5,311
Convertible senior debentures - non-current	45,694	44,630
Commitments and contingencies
Equity:
Preferred stock, $0.10 par value; 1,000 shares authorized
Common stock, $0.10 par value; 83,333 shares authorized; 20,752 and 20,630 shares issued and outstanding in 2011 and 2010, respectively	2,075	2,063
Additional paid-in capital	810,956	806,859
Accumulated deficit	(464,710)	(575,307)
Accumulated other comprehensive income (loss)	(41)	12,816
Total equity	348,280	246,431
Total Liabilities and Equity	$ 406,636	$ 336,545