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v3.21.1

DEBT AND CREDIT FACILITY - Narrative (Details) - USD ($) |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 30, 2020 | Jan. 31, 2020 | Mar. 19, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2017 | Aug. 04, 2015
Investments [Line Items] |  |  |  |  |  |  |  |
Debt repayment |  |  |  | $ 35,000,000 | $ 0 | [1] |  |
Redemption of convertible instruments |  |  |  |  | 4,825,000 |  |  |
Loss on redemption of convertible debt |  |  |  | 0 | 5,423,000 | [1] |  |
Redemption of convertible notes |  |  |  | 114,994,000 | 152,250,000 | [1] |  |
Borrowings |  |  |  | 390,670,000 | 284,049,000 |  |  |
Equity component of convertible notes |  |  |  | 106,425,000 | 106,425,000 |  |  |
Restricted cash |  |  |  | 35,288,000 | 2,339,000 |  |  |
Equity component of convertible notes |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Redemption of convertible instruments |  |  |  |  | 4,825,000 |  |  |
2013 Notes |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Debt instrument, repurchase amount |  |  | $ 150,000,000.0 |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 2.875% |  |  |  |  |
Debt repayment | $ 115,500,000 |  | $ 152,200,000 |  |  |  |  |
Debt instrument, fair value disclosure |  |  | $ 147,400,000 |  |  |  |  |
Fair value inputs, discount rate |  |  | 4.95% |  |  |  |  |
Redemption of convertible instruments | 2,000 | $ 4,000 |  |  |  |  |  |
Loss on redemption of convertible debt |  |  | $ 5,400,000 |  |  |  |  |
Redemption of convertible notes | 115,000,000.0 |  | 142,000,000.0 | 114,994,000 | 141,982,000 |  |  |
Debt, tax recovery |  |  | 1,700,000 |  |  |  |  |
Borrowing costs capitalised |  | $ 49,000 |  |  |  |  |  |
Accrued interest on borrowings | $ 500,000 |  |  |  |  |  |  |
Borrowings |  |  |  | 0 | 114,280,000 |  |  |
2013 Notes | Equity component of convertible notes |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Redemption of convertible instruments |  |  | $ 4,800,000 |  |  |  |  |
2019 Notes |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  | 2.50% |  |  |  |  |
Debt instrument, fair value disclosure |  |  |  | $ 169,400,000 |  |  |  |
Fair value inputs, discount rate |  |  |  | 7.50% |  |  |  |
Borrowings |  |  | $ 230,000,000.0 | $ 177,582,000 | 169,769,000 |  |  |
Proceeds from convertible debt |  |  | 222,900,000 |  |  |  |  |
Payments for debt issue costs |  |  | $ 7,100,000 |  |  |  |  |
Debt conversion, converted instrument, shares issued |  |  | 54.1082 |  |  |  |  |
Debt instrument, convertible, conversion price (in usd per share) |  |  | $ 18.48 |  |  |  |  |
Number of trading days sale price exceeds conversion price |  |  |  | 20 days |  |  |  |
Number of consecutive trading days |  |  |  | 30 days |  |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger |  |  |  | 130.00% |  |  |  |
Debt instrument, term |  |  |  | 7 years |  |  |  |
Equity component of convertible notes, gross |  |  |  | $ 44,800,000 |  |  |  |
Equity component of convertible notes |  |  |  | 60,600,000 |  |  |  |
Reserve of equity component of convertible instruments, deferred tax liability |  |  |  | 15,900,000 |  |  |  |
Debt issuance costs, net |  |  |  | 7,100,000 |  |  |  |
Debt issuance costs, allocation, debt portion |  |  |  | 5,200,000 |  |  |  |
Debt issuance costs, allocation, equity portion |  |  |  | 1,900,000 |  |  |  |
Debt, net of transactions cost, fair value |  |  |  | 164,200,000 |  |  |  |
Term loan |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  |  | 210,000,000 | 0 |  |  |
Restricted cash |  |  |  | $ 32,900,000 |  |  |  |
Borrowings, historic and forecast debt service cover ratio |  |  |  | 1.20 |  |  |  |
Borrowings, loan life cover ratio |  |  |  | 1.30 |  |  |  |
Borrowings, minimum tail reserves as a percentage of total reserves |  |  |  | 30.00% |  |  |  |
Term loan | Alacer |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Borrowings recognised as of acquisition date |  |  |  | $ (245,000,000) |  |  |  |
Term loan | London Interbank Offered Rate (LIBOR) | Interest rate swap contract | Interest rate risk |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Notional amount, outstanding term loan balance as part of acquisition, percentage |  |  |  | 37.00% |  |  |  |
Fixed rate of hedging instrument |  |  |  | 2.86% |  |  |  |
Term loan | Minimum | London Interbank Offered Rate (LIBOR) | Interest rate risk |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 3.50% |  |  |  |
Term loan | Maximum | London Interbank Offered Rate (LIBOR) | Interest rate risk |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 3.70% |  |  |  |
Credit Facility |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Borrowings |  |  |  | $ 700,000 | $ 600,000 |  |  |
Notional amount |  |  |  |  |  |  |  | $ 75,000,000.0
Borrowing capacity, accordion feature |  |  |  |  |  |  | $ 25,000,000.0 |
Line of credit facility, financial letters of credit, percentage |  |  |  | 66.00% |  |  |  |
Line of credit facility, utilization fees, percentage |  |  |  | 0.25% |  |  |  |
Line of credit facility, standby fees, percentage |  |  |  | 25.00% |  |  |  |
Credit Facility | Minimum |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, utilization fees from application margin, percentage |  |  |  | 0.25% |  |  |  |
Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) | Interest rate risk |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 2.25% |  |  |  |
Credit Facility | Maximum |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, utilization fees from application margin, percentage |  |  |  | 0.75% |  |  |  |
Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) | Interest rate risk |  |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  | 3.75% |  |  |  |
[1] | See note 2(r)

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