CASH, CASH EQUIVALENTS AND INVESTMENTS (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Cash and Cash Equivalents [Line Items]
Investments, Amortized Cost Basis	$ 274,668	$ 246,171
Investments, Unrealized Gains	28	18
Investments, Unrealized Losses	(79)	(54)
Investments	274,617	246,135
Certificates of Deposit [Member]
Cash and Cash Equivalents [Line Items]
Cash Equivalents, at Carrying Value	11,323	11,373
Cash equivalents, Unrealized Gains	10	4
Cash Equivalents, Unrealized Losses	(6)	(13)
Cash equivalents	11,327	11,364
Corporate Bonds [Member]
Cash and Cash Equivalents [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	259,883	228,799
Available-for-sale Securities, Unrealized Gains	18	14
Available-for-sale Securities, Unrealized Losses	71	41
Available-for-sale Securities	259,830	228,772
US Government [Member]
Cash and Cash Equivalents [Line Items]
Available-for-sale Debt Securities, Amortized Cost Basis	3,462	5,999
Available-for-sale Securities, Unrealized Gains	0	0
Available-for-sale Securities, Unrealized Losses	2	0
Available-for-sale Securities	$ 3,460	$ 5,999

Cash Equivalents, Gross Unrealized Gain

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Cash Equivalents, Gross Unrealized Losses

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Investments, Amortized Cost Basis

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Investments, Gross Unrealized Gains

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Investments, Gross Unrealized Losses

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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-Glossary Cash

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Sum of the carrying amounts as of the balance sheet date of all investments.

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