FAIR VALUE MEASUREMENTS - DEBT (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Jul. 12, 2013	Nov. 16, 2011
1.75% Convertible Notes due 2016
LONG-TERM DEBT
Estimated fair value of convertible notes	$ 457,025		$ 197,373
Interest rate on convertible notes (as a percent)	1.75%		1.75%
1.00% Convertible Notes due 2018
LONG-TERM DEBT
Estimated fair value of convertible notes	$ 478,745	$ 225,567
Interest rate on convertible notes (as a percent)	1.00%	1.00%

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Convertible Security
-URI http://asc.fasb.org/extlink&oid=6509036

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

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.

+ References

No definition available.

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