CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash Flows from Operating Activities:
Net cash used in operating activities	$ (6,481)	$ (7,816)
Cash Flows from Investing Activities:
Proceeds from sales of and distributions from companies	2,192	77,187
Acquisitions of ownership interests in companies	(14,129)	(5,361)
Advances and loans to companies	(8,338)	(528)
Repayment of advances and loans to companies	28	1,962
Increase in marketable securities	(9,337)	(16,400)
Decrease in marketable securities	8,815	18,914
Capital expenditures	(110)	(11)
Other	0	5
Net cash provided by (used in) investing activities	(20,879)	75,768
Cash Flows from Financing Activities:
Issuance of Company common stock, net	549	522
Repurchase of Company common stock	0	(8,040)
Net cash provided by (used in) financing activities	549	(7,518)
Net change in cash and cash equivalents	(26,811)	60,434
Cash and cash equivalents at beginning of period	111,897	139,318
Cash and cash equivalents at end of period	$ 85,086	$ 199,752