CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities:
Net cash used in operating activities	$ (6,541)	$ (5,840)
Cash Flows from Investing Activities:
Proceeds from sales of and distributions from companies	15,753	4,194
Acquisitions of ownership interests in companies	(4,476)	(17,073)
Advances and loans to companies	(6,429)	(7,119)
Repayment of advances and loans to companies	0	28
Decrease in marketable securities	10,268	26,602
Capital expenditures	0	(22)
Net cash provided by investing activities	15,116	6,610
Cash Flows from Financing Activities:
Issuance of Company common stock, net	10	0
Tax withholdings related to equity-based awards	(100)	0
Repurchase of Company common stock	0	(5,445)
Net cash used in financing activities	(90)	(5,445)
Net change in cash, cash equivalents and restricted cash equivalents	8,485	(4,675)
Cash, cash equivalents and restricted cash equivalents at beginning of period	28,394	32,838
Cash, cash equivalents and restricted cash equivalents at end of period	$ 36,879	$ 28,163