FAIR VALUE MEASUREMENTS Unobservable Inputs Reconciliation - Assets (Details) (Fair Value, Measurements, Recurring, Level 3, USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 47,065		$ 42,710		$ 42,512		$ 24,588
Additions - fair value elections in 2013			0				3,065
Purchases	2,756		1,000		13,294		43,827
Sales	(137)		(32)		(6,365)		(23,722)
Realized gain (loss) on sale	0	[1]	0	[1]	(129)	[1]	1,556	[1]
Unrealized gains	2,491		1,029		6,528		1,126
Unrealized losses	(1,076)		(9,012)		(4,741)		(14,745)
Balance at end of period	51,099		35,695		51,099		35,695
Investments in Associated Companies
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	2,080	[2]	8,582	[2]	2,243	[2]	10,521	[2]
Additions - fair value elections in 2013			0	[2]			3,065	[2]
Purchases	0	[2]	1,000	[2]	0	[2]	1,311	[2]
Sales	0	[2]	0	[2]	0	[2]	0	[2]
Realized gain (loss) on sale	0	[2]	0	[2]	0	[2]	0	[2]
Unrealized gains	0	[2]	114	[2]	0	[2]	114	[2]
Unrealized losses	(49)	[2]	(6,206)	[2]	(212)	[2]	(11,521)	[2]
Balance at end of period	2,031	[2]	3,490	[2]	2,031	[2]	3,490	[2]
Other Investments - Related Party
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	10,205	[3]	10,341	[3]	10,228	[3]	11,263	[3]
Additions - fair value elections in 2013			0	[3]			0	[3]
Purchases	0	[3]	0	[3]	0	[3]	0	[3]
Sales	0	[3]	0	[3]	(1,496)	[3]	(764)	[3]
Realized gain (loss) on sale	0	[3]	0	[3]	0	[3]	0	[3]
Unrealized gains	1,307	[3]	915	[3]	2,884	[3]	826	[3]
Unrealized losses	(694)	[3]	(15)	[3]	(798)	[3]	(84)	[3]
Balance at end of period	10,818	[3]	11,241	[3]	10,818	[3]	11,241	[3]
ModusLink Warrants
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	2,434	[4]	2,835	[4]	5,832	[4]	0	[4]
Additions - fair value elections in 2013			0	[4]			0	[4]
Purchases	0	[4]	0	[4]	0	[4]	3,184	[4]
Sales	0	[4]	0	[4]	0	[4]	0	[4]
Realized gain (loss) on sale	0	[4]	0	[4]	0	[4]	0	[4]
Unrealized gains	0	[4]	0	[4]	0	[4]	0	[4]
Unrealized losses	(333)	[4]	(581)	[4]	(3,731)	[4]	(930)	[4]
Balance at end of period	2,101	[4]	2,254	[4]	2,101	[4]	2,254	[4]
Marketable Securities and Other
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	32,346	[1]	20,952	[1]	24,209	[1]	2,804	[1]
Additions - fair value elections in 2013			0	[1]			0	[1]
Purchases	2,756	[1]	0	[1]	13,294	[1]	39,332	[1]
Sales	(137)	[1]	(32)	[1]	(4,869)	[1]	(22,958)	[1]
Realized gain (loss) on sale	0	[1]	0	[1]	(129)	[1]	1,556	[1]
Unrealized gains	1,184	[1]	0	[1]	3,644	[1]	186	[1]
Unrealized losses	0	[1]	(2,210)	[1]	0	[1]	(2,210)	[1]
Balance at end of period	$ 36,149	[1]	$ 18,710	[1]	$ 36,149	[1]	$ 18,710	[1]

[1] Realized gains on sale are recorded in Other expense (income), net in the Company's Consolidated Statements of Operations.

[2] Unrealized losses are recorded in Income (Loss) of associated companies, net of taxes in the Company's Consolidated Statements of Operations.

[3] Unrealized gains and losses are recorded in Income from other investments-related party in the Company's Consolidated Statements of Operations.

[4] Unrealized gains and losses are recorded in (Loss) Income from investments held at fair value in the Company's Consolidated Statements of Operations.