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DEBT AND CREDIT FACILITY - Outstanding Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 19, 2019
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Disclosure of detailed information about borrowings [line items] |  |  |
Carrying amount | $ 390,670 | $ 284,049 |
Convertible Note |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Carrying amount | 177,582 | 284,049 |
2013 Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Carrying amount | 0 | 114,280 |
2019 Notes |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Carrying amount | 177,582 | 169,769 | $ 230,000
Term loan |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Carrying amount | 210,000 | 0 |
Other |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Carrying amount | $ 3,088 | $ 0 |

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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