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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
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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%

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- 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 + Details
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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 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 + Details
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