CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities:
Net cash used in operating activities	$ (14,086)	$ (15,475)
Cash Flows from Investing Activities:
Proceeds from sales of and distributions from companies	25,029	81,626
Acquisitions of ownership interests in companies	(52,181)	(54,956)
Advances and loans to companies	(10,935)	(9,868)
Repayment of advances and loans to companies	1,290	5,509
Increase in marketable securities	(23,875)	(44,578)
Decrease in marketable securities	28,043	39,979
Capital expenditures	(402)	(11)
Other	0	5
Net cash provided by (used in) investing activities	(33,031)	17,706
Cash Flows from Financing Activities:
Issuance of Company common stock, net	676	612
Repurchase of convertible senior debentures	0	(441)
Repurchase of Company common stock	(1,748)	(25,036)
Net cash used in financing activities	(1,072)	(24,865)
Net change in cash and cash equivalents	(48,189)	(22,634)
Cash and cash equivalents at beginning of period	111,897	139,318
Cash and cash equivalents at end of period	$ 63,708	$ 116,684