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Threshold period of specified consecutive trading days within which trading price of the notes must be less than 98% of the product of the last reported sale price of our common stock and the conversion rate on such date.

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The percentage by which the conversion price exceeds the last reported trading price of the common stock on the date of issuance of the convertible debt instrument.

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Convertible debt, threshold percentage, product of common stock price and conversion price

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Threshold number of common shares that may be issued upon conversion of the notes above which requires shareholder approval.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger eligibility for redemption, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of redemption.

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Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger redemption.

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Fair value of convertible debt conversion feature

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Fair value of similar notes without conversion feature

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Number of business days after the specified trading price criteria met that notes may be converted.

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Number of shares that would require cash settlement

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Percentage of maximum number of shares that would require cash settlement

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Percentage of the maximum number of shares authorized for issuance

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Percentage of common shares outstanding that could be exceeded if the convertible notes are converted into common shares.

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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.

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The price per share of the conversion feature embedded in the debt instrument.

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Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity.

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Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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

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

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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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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount, after accumulated amortization, of debt discount.

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

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Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

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Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

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The tax effect of an increase or decrease in contributed capital (for example, deductible expenditures reported as a reduction of the proceeds from issuing capital stock) during the period charged or credited directly to shareholders' equity.

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The total of the cash outflow during the period which has been paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt and the cost incurred directly for the issuance of equity securities.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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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.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Price of a single share of a number of saleable stocks of a company.

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LONG-TERM DEBT, DERIVATIVES AND LETTERS OF CREDIT - Convertible Debt, Additional Information (Details) $ / shares in Units, $ in Thousands				12 Months Ended
	May 17, 2018 USD ($)	Jul. 31, 2017 USD ($)	Jul. 25, 2017 $ / shares	Dec. 31, 2019 USD ($) shares days $ / shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Debt Instrument [Line Items]
Principal				$ 353,876
Debt instrument, convertible, threshold percentage of conversion price trigger for redemption				130.00%
Debt instrument, convertible, threshold trading days for redemption \| days				20
Threshold consecutive trading days for redemption				30 days
Issuance of convertible debt, net of issuance costs				$ 0	$ 0	$ 222,311
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%
Tax impact of convertible debt embedded derivative liability reclassification to equity	$ 7,800
(Loss) gain on convertible debt embedded derivative				$ 0	(24,783)	$ 818
Fair value of similar notes without conversion feature		$ 194,200
Fair value of convertible debt conversion feature		35,800
Carrying amount of convertible debt equity component, before issuance costs		14,400
Issuance costs, allocated to equity							$ 100
Convertible debt, remaining amortization period				43 months
Convertible debt
Debt Instrument [Line Items]
Issuance of convertible debt, face amount		$ 230,000
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
Threshold trading days \| days				20
Threshold consecutive trading days \| days				30
Threshold percentage of stock 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%
Number of shares into which debt is convertible \| shares				10,599,067
Shares outstanding, percentage threshold				19.99%
Convertible debt, threshold shares, approval of shareholders \| shares				5,964,858
Redemption price, percentage (equal to)				100.00%
Issuance of convertible debt, net of issuance costs		$ 222,300
Embedded derivative liability		21,400
Debt discount		35,800		$ 23,625	$ 28,982
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
Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of outstanding borrowings on revolving credit facility		$ 62,300
Credit Facility \| Not Designated as Hedging Instrument
Debt Instrument [Line Items]
Embedded derivative liability	$ 45,400