CASH, CASH EQUIVALENTS, AND AVAILABLE-FOR-SALE SECURITIES (Fair Value of Cash, Cash Equivalents, and Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Cash and Cash Equivalents, at Carrying Value	$ 67,753	$ 84,783	$ 83,701	$ 95,395
Available-for-sale securities including cash and cash equivalents, Amortized Cost Total	260,721	270,134
Less amounts classified as cash equivalents, Amortized Cost	(67,753)	(84,783)	$ (83,701)	$ (95,395)
Available-for-sale Debt Securities, Amortized Cost Basis, Total	192,968	185,351
Available-for-sale securities, Gross Unrealized Gains	75	59
Available-for-sale securities, Gross Unrealized Losses	(566)	(674)
Available-for-sale Securities, Debt Securities, Current	192,477	184,736
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Cash and Cash Equivalents, Fair Value Disclosure	67,753	84,783
Cash and cash equivalents and available for sale securities, Fair Value Disclosure	260,230	269,519
Less amounts classified as cash equivalents, Estimated Fair Value	(67,753)	(84,783)
Available-for-sale Securities, Debt Securities, Current	$ 192,477	184,736
Maximum original contractual maturities of available for sale securities	67 months
U.S. Treasury securities
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Available-for-sale Debt Securities, Amortized Cost Basis, Total	$ 24,701	24,780
Available-for-sale securities, Gross Unrealized Gains	7	7
Available-for-sale securities, Gross Unrealized Losses	(98)	(110)
Available-for-sale Securities, Debt Securities, Current	24,610	24,677
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Available-for-sale Securities, Debt Securities, Current	24,610	24,677
Corporate Debt Securities [Member]
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Available-for-sale Debt Securities, Amortized Cost Basis, Total	168,267	160,571
Available-for-sale securities, Gross Unrealized Gains	68	52
Available-for-sale securities, Gross Unrealized Losses	(468)	(564)
Available-for-sale Securities, Debt Securities, Current	167,867	160,059
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Available-for-sale Securities, Debt Securities, Current	167,867	160,059
Cash and money market funds
Cash and cash equivalents and available-for-sale securities, Amortized Cost
Cash and Cash Equivalents, at Carrying Value	67,753	84,783
Less amounts classified as cash equivalents, Amortized Cost	(67,753)	(84,783)
Available-for-sale securities, Gross Unrealized Losses		0
Cash and cash equivalents and available-for-sale securities, Estimated Fair Value
Cash and Cash Equivalents, Fair Value Disclosure	67,753	84,783
Less amounts classified as cash equivalents, Estimated Fair Value	$ (67,753)	$ (84,783)

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

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-Publisher FASB
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Amount 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Publisher FASB
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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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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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

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Represents the maturity period of available-for-sale securities.

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