CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash Flows from Operating Activities:
Net cash used in operating activities	$ (10,843)	$ (11,245)
Cash Flows from Investing Activities:
Proceeds from sales of and distributions from companies	72,824	11,379
Acquisitions of ownership interests in companies	(28,329)	(40,545)
Advances and loans to companies	(10,151)	(10,935)
Repayment of advances and loans to companies	56	55
Increase in marketable securities	(14,604)	(16,763)
Decrease in marketable securities	30,257	16,676
Capital expenditures	(73)	(244)
Net cash provided by (used in) investing activities	49,980	(40,377)
Cash Flows from Financing Activities:
Issuance of Company common stock, net	0	549
Tax withholdings related to equity-based awards	(355)	0
Repurchase of Company common stock	(5,389)	0
Net cash provided by (used in) financing activities	(5,744)	549
Net change in cash and cash equivalents	33,393	(51,073)
Cash and cash equivalents at beginning of period	32,838	111,897
Cash and cash equivalents at end of period	$ 66,231	$ 60,824