FAIR VALUE MEASUREMENTS (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 1 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Mar. 31, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Mar. 31, 2014 Reported Value Measurement [Member]	Dec. 31, 2013 Reported Value Measurement [Member]	Mar. 31, 2014 Convertible notes [Member]	Dec. 31, 2013 Convertible notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value										$ 300,000	$ 4,300,000
Available-for-sale Debt Securities, Amortized Cost Basis	4,000,000									300,000	4,300,000
Cash and Cash Equivalents, Fair Value Disclosure		11,801,000	7,600,000	0	0	0	0	11,801,000	7,600,000
Short Term Investments Fair Value Disclosure		230,990,000	202,024,000	0	0	0	0	230,990,000	202,024,000
Long Term Investments Fair Value Disclosure		2,751,000	3,117,000	0	0	300,000	4,300,000	3,051,000	7,417,000
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	(4,000,000)
Proceeds from Notes Payable	$ 4,600,000