CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash Flows from Operating Activities:
Net cash used in operating activities	$ (11,407)	$ (10,843)
Cash Flows from Investing Activities:
Proceeds from sales of and distributions from companies	16,462	72,824
Acquisitions of ownership interests in companies	(8,026)	(28,329)
Advances and loans to companies	(13,564)	(10,151)
Repayment of advances and loans to companies	0	56
Increase in marketable securities	0	(14,604)
Decrease in marketable securities	10,268	30,257
Capital expenditures	0	(73)
Net cash provided by investing activities	5,140	49,980
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	(11,796)	0
Issuance of Company common stock, net	12	0
Tax withholdings related to equity-based awards	(130)	(355)
Repurchase of Company common stock	0	(5,389)
Net cash provided by (used in) financing activities	32,390	(5,744)
Net change in cash, cash equivalents and restricted cash equivalents	26,123	33,393
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	$ 54,517	$ 66,231