Consolidated Balance Sheets (Unaudited) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 203,437	$ 183,419
Cash held in escrow	6,433	6,434
Marketable securities	51,220	42,411
Restricted cash equivalents	5,023	4,893
Prepaid expenses and other current assets	1,060	785
Total current assets	267,173	237,942
Property and equipment, net	238	295
Ownership interests in and advances to partner companies	108,770	60,256
Available-for-sale securities	20,212	25,447
Long-term marketable securities	8,513	0
Long-term restricted cash equivalents	9,505	11,881
Other	626	724
Total Assets	415,037	336,545
Current Liabilities:
Convertible senior debentures - current	0	31,289
Accounts payable	287	493
Accrued compensation and benefits	2,594	4,168
Accrued expenses and other current liabilities	5,017	4,223
Total current liabilities	7,898	40,173
Other long-term liabilities	4,214	5,311
Convertible senior debentures - non-current	45,373	44,630
Commitments and contingencies
Equity:
Preferred stock, $0.10 par value; 1,000 shares authorized	0	0
Common stock, $0.10 par value; 83,333 shares authorized; 20,685 and 20,630 shares issued and outstanding in 2011 and 2010, respectively	2,068	2,063
Additional paid-in capital	809,274	806,859
Accumulated deficit	(462,502)	(575,307)
Accumulated other comprehensive income	8,712	12,816
Total equity	357,552	246,431
Total Liabilities and Equity	$ 415,037	$ 336,545