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DEBT (Details) - USD ($) shares in Thousands, $ in Thousands	1 Months Ended		6 Months Ended
	May 31, 2017	Mar. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Settlement Period - Convertible Debt Conversion Request			40 days
Debt Conversion, Converted Instrument, Shares Issued	10	2,500
Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Debt Instrument, Repurchased Face Amount		$ 117,700	$ 500
Total debt, net of debt discount and deferred financing costs			300
Debt Instrument, Repurchase Amount		$ 118,200	500
Unsecured Debt | Convertible Senior Notes Due 2022
Debt Instrument [Line Items]
Convertible senior notes, gross			345,000	$ 0
Deferred financing costs			(8,272)	0
Discount on debt			(67,400)	0
Total debt, net of debt discount and deferred financing costs			269,328	0
Unsecured Debt | Convertible Senior Notes Due 2019
Debt Instrument [Line Items]
Convertible senior notes, gross			340	118,531
Deferred financing costs			(3)	(1,276)
Discount on debt			(18)	(8,517)
Total debt, net of debt discount and deferred financing costs			$ 319	$ 108,738

X

- Definition

The number of trading days in a settlement period for convertible debt conversion requests.

+ References

No definition available.

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- Definition

The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586

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- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ 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))
-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.

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- Definition

Fair value amount of debt instrument that was repurchased.

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- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

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- Definition

Amount, after accumulated amortization, of debt discount.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
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- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section S99
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