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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014 1.75% Convertible Notes due 2016	Nov. 16, 2011 1.75% Convertible Notes due 2016	Sep. 30, 2014 1.00% Convertible Notes due 2018	Jun. 18, 2013 1.00% Convertible Notes due 2018
LONG-TERM DEBT
Estimated fair value of convertible notes	$ 332,500	$ 197,373	$ 353,309	$ 225,567
Interest rate on convertible notes (as a percent)	1.75%	1.75%	1.00%	1.00%

X

- Definition

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.

+ References

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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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5



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 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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