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CONVERTIBLE NOTES (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 17, 2018 USD ($) | Mar. 31, 2018 USD ($) $ / shares
Debt Instrument [Line Items] |  |
Proceeds from issuance of notes |  | $ 671,091
Debt, net of discounts and deferred financing costs: |  |
Principal |  | 690,000
Debt discount, net |  | (190,206)
Deferred financing costs |  | (13,106)
Total |  | $ 486,688
Convertible Notes |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 690,000 |
Fixed interest rate (as a percent) | 1.00% |
Proceeds from issuance of notes | $ 671,100 |
Conversion rate, number of shares to be issued per $1000 of principal amount (in shares) |  | 13.2569
Conversion price (in dollars per share) | $ / shares |  | $ 75.43
Repurchase price, as percentage of principal amount, if company undergoes change of control |  | 100
Liability component of debt |  | $ 495,100
Effective interest rate (as a percent) |  | 6.00%
Equity component of debt |  | $ 194,900
Total transaction costs |  | $ 18,800
Interest expense amortization term |  | 7 years
Convertible Notes | Maximum |  |
Debt Instrument [Line Items] |  |
Total transaction costs |  | $ 13,100

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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