DEBT - 1.00 CONVERTIBLE NOTES (Details) - 1.00% Convertible Notes due 2018 - USD ($)	Jun. 18, 2013	Mar. 31, 2019
Convertible Notes
Interest rate		1.00%
Convertible Debt
Convertible Notes
Interest rate	1.00%
Principal amount at issuance	$ 250,000,000
Percentage of par value at which debt was issued	98.50%
Proceeds from issuance of debt	$ 283,188,000
Proceeds from Convertible Debt, Overallotment	$ 37,500,000

Represents the amount of debt issued as a percentage of its par value.

No definition available.

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- Definition

Proceeds from Convertible Debt, Overallotment

+ References

No definition available.

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

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-Section 55
-Paragraph 8
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-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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- References

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- Definition

The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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