CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash Flows from Operating Activities:
Net loss	$ (5,149)us-gaap_ProfitLoss	$ (35,525)us-gaap_ProfitLoss	$ (39,362)us-gaap_ProfitLoss
Adjustments to reconcile to net cash used in operating activities:
Depreciation	74	92	108
Amortization of debt discount	1,085	995	726
Equity loss	15,335	12,607	26,517
Other (income) loss, net	(31,657)us-gaap_OtherNonoperatingIncomeExpense	(383)us-gaap_OtherNonoperatingIncomeExpense	(9,338)us-gaap_OtherNonoperatingIncomeExpense
Stock-based compensation expense	1,935us-gaap_ShareBasedCompensation	1,821us-gaap_ShareBasedCompensation	2,014us-gaap_ShareBasedCompensation
Changes in assets and liabilities:
Accounts receivable, net	(369)	(1,194)	(418)
Accounts payable, accrued expenses, and other	(1,443)	366	3,228
Net cash used in operating activities	(20,189)	(21,221)	(16,525)
Cash Flows from Investing Activities:
Acquisitions of ownership interests in companies	(59,476)	(41,838)	(46,100)
Proceeds from sales of and distributions from companies	82,822	38,974	17,596
Advances and loans to companies	(10,968)us-gaap_PaymentsForAdvanceToAffiliate	(10,464)us-gaap_PaymentsForAdvanceToAffiliate	(13,665)us-gaap_PaymentsForAdvanceToAffiliate
Repayment of advances and loans to companies	4,684	1,651	3,214
Increase in marketable securities	(55,594)	(69,883)	(242,023)
Decrease in marketable securities	55,410	165,379	276,392
Release of restricted cash equivalents for interest on convertible senior debentures	5	0	7,701
Capital expenditures	(59)	(37)	(73)
Proceeds from sale of discontinued operations, net	0	6,434	0
Other, net	132	42	74
Net cash provided by investing activities	16,956	90,258	3,116
Cash Flows from Financing Activities:
Proceeds from issuance of convertible senior debentures	0us-gaap_ProceedsFromConvertibleDebt	0us-gaap_ProceedsFromConvertibleDebt	55,000us-gaap_ProceedsFromConvertibleDebt
Repurchase of convertible senior debentures	(441)us-gaap_RepaymentsOfConvertibleDebt	(43)us-gaap_RepaymentsOfConvertibleDebt	(58,703)us-gaap_RepaymentsOfConvertibleDebt
Costs of issuance of convertible senior debentures	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	(1,790)us-gaap_PaymentsOfDebtIssuanceCosts
Issuance of Company common stock, net	1,289	4,417	1,744
Repurchase of Company common stock	(25,036)	(122)	0
Net cash provided by (used in) financing activities	(24,188)	4,252	(3,749)
Net change in cash and cash equivalents	(27,421)	73,289	(17,158)
Cash and cash equivalents at beginning of period	139,318	66,029	83,187
Cash and cash equivalents at end of period	$ 111,897	$ 139,318	$ 66,029

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