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DEBT AND CREDIT FACILITY - Summary of Changes in Debt (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 30, 2020 | Mar. 19, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Debt [Roll Forward] |  |  |  |  |
Balance, beginning of year |  |  | $ 286,852 | $ 250,729 |
Interest paid |  |  | (12,444) | (9,104) |
Redemption of 2013 Notes |  |  | (114,994) | (152,250) | [1]
Issuance of debt |  |  | 3,088 | 0 | [1]
Principal paid on Term Loan |  |  | (35,000) | 0 | [1]
Interest expense |  |  | 19,916 | 23,049 |
Redemption of 2013 Notes - converted to equity |  |  | (6) |  |
Term Loan assumed |  |  | 245,000 | 0 |
Proceeds from issuance of debt |  |  | 3,088 | 0 | [1]
Balance, end of year |  |  | 392,412 | 286,852 |
Less: Accrued interest |  |  | (1,742) | (2,803) |
Carrying amount |  |  | 390,670 | 284,049 |
Current borrowings |  |  | 71,025 | 114,280 |
Non-current borrowings |  |  | 319,645 | 169,769 |
2013 Notes |  |  |  |  |
Debt [Roll Forward] |  |  |  |  |
Redemption of 2013 Notes | $ (115,000) | $ (142,000) | (114,994) | (141,982) |
Principal paid on Term Loan | $ (115,500) | (152,200) |  |  |
Redemption of 2013 Notes - converted to equity |  |  | (6) | 0 |
Carrying amount |  |  | 0 | 114,280 |
2019 Notes |  |  |  |  |
Debt [Roll Forward] |  |  |  |  |
Issuance of debt |  |  | 0 | 164,160 |
Proceeds from issuance of debt |  |  | 0 | 164,160 |
Carrying amount |  | $ 230,000 | $ 177,582 | $ 169,769 |
[1] | See note 2(r)

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