CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows from Operating Activities:
Net cash used in operating activities	$ (15,515)	$ (14,114)
Cash Flows from Investing Activities:
Proceeds from sales of and distributions from companies	16,604	73,854
Acquisitions of ownership interests in companies	(11,851)	(34,841)
Advances and loans to companies	(16,933)	(17,741)
Repayment of advances and loans to companies	0	1,741
Increase in marketable securities	0	(18,733)
Decrease in marketable securities	10,268	35,386
Capital expenditures	0	(73)
Net cash provided by (used in) investing activities	(1,912)	39,593
Cash Flows from Financing Activities:
Proceeds from credit facility	50,000	0
Issuance costs of credit facility	(5,696)	0
Repurchase of convertible senior debentures	(14,455)	0
Issuance of Company common stock, net	12	5
Tax withholdings related to equity-based awards	(175)	(437)
Repurchase of Company common stock	0	(5,389)
Net cash provided by (used in) financing activities	29,686	(5,821)
Net change in cash, cash equivalents and restricted cash equivalents	12,259	19,658
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	$ 40,653	$ 52,496