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LONG-TERM DEBT, DERIVATIVES AND LETTERS OF CREDIT - Convertible Debt (Details) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
May 17, 2018 USD ($) | Jul. 31, 2017 USD ($) | Jul. 25, 2017 $ / shares | Dec. 31, 2018 USD ($) shares days $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal |  |  |  | $ 386,843 |  |  |  |
Debt instrument, convertible, threshold percentage of conversion price trigger for redemption |  |  |  | 130.00% |  |  |  |
Debt instrument, convertible, threshold trading days for redemption | days |  |  |  | 20 |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days for redemption |  |  |  | 30 days |  |  |  |
Issuance of convertible debt, net of issuance costs |  |  |  | $ 0 |  | $ 222,311 |  | $ 0
Percentage of the maximum number of shares authorized for issuance |  |  |  | 40.00% |  |  |  |
Percentage of maximum number of shares that would require cash settlement |  |  |  | 60.00% |  |  |  |
Fair value of similar notes without conversion feature |  | $ 194,200 |  |  |  |  |  |
Fair value of convertible debt conversion feature |  | 35,800 |  |  |  |  |  |
Tax impact of convertible debt embedded derivative liability reclassification to equity | $ 7,800 |  |  |  |  |  |  |
(Loss) gain on convertible debt embedded derivative |  |  |  | $ (24,783) |  | 818 |  | 0
Carrying amount of convertible debt equity component, before issuance costs |  | $ 14,400 |  |  |  |  |  |
Issuance costs, allocated to equity |  |  |  |  |  |  |  | $ 100
Convertible debt, remaining amortization period |  |  |  | 55 months |  |  |  |
Convertible debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal |  |  |  | $ 230,000 |  | 230,000 |  |
Interest rate on convertible debt |  | 5.00% |  | 5.00% |  |  |  |
Initial conversion rate, convertible debt |  |  |  | 46.0829 |  |  |  |
Initial conversion price, convertible debt | $ / shares |  |  |  | $ 21.70 |  |  |  |
Conversion premium |  |  | 40.00% |  |  |  |  |
Share Price | $ / shares |  |  | $ 15.50 |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | days |  |  |  | 20 |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | days |  |  |  | 30 |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Conversion Price Trigger |  |  |  | 130.00% |  |  |  |
Number of business days after the specified trading price criteria met that notes may be converted | days |  |  |  | 5 |  |  |  |
Consecutive trading days, trading price criteria |  |  |  | 5 days |  |  |  |
Convertible debt, threshold percentage, product of common stock price and conversion price |  |  |  | 98.00% |  |  |  |
Shares outstanding, percentage threshold |  |  |  | 19.99% |  |  |  |
Convertible debt, threshold shares, approval of shareholders | shares |  |  |  | 5,964,858 |  |  |  |
Number of shares into which debt is convertible | shares |  |  |  | 10,599,067 |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |  |  |  |
Issuance of convertible debt, net of issuance costs |  | $ 222,300 |  |  |  |  |  |
Embedded derivative liability |  | 21,400 |  | $ 0 | [1] | 20,594 | [1] |
Debt discount |  | 35,800 |  | $ 28,982 |  | 33,882 |  |
Debt Instrument, Term |  |  |  | 72 months |  |  |  |
Total issuance costs associated with the Notes |  |  |  | $ 7,700 |  |  |  |
Convertible debt issuance costs, allocated to debt |  |  |  | 7,200 |  |  |  |
Issuance costs, allocated to equity |  |  |  | $ 500 |  |  |  |
Convertible debt | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Number of shares into which debt is convertible | shares |  |  |  | 14,838,703 |  |  |  |
Number of shares that would require cash settlement | shares |  |  |  | 8,873,845 |  |  |  |
Term Loan Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of term loan |  | 160,000 |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 5 years |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayments of outstanding borrowings on revolving credit facility |  | $ 62,300 |  |  |  |  |  |
Debt Instrument, Term |  |  |  | 5 years |  |  |  |
Credit Facility | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Embedded derivative liability | $ 45,400 |  |  | $ 0 |  | $ 20,594 |  |
[1] | The embedded derivative liability was reclassified to stockholders’ equity as of May 17, 2018 and is no longer marked to fair value each period, as discussed further below. It is excluded from the table above as of December 31, 2018.

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