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DEBT - Convertible Debt (Details) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2020 USD ($) | Jan. 31, 2020 USD ($) | Mar. 19, 2019 USD ($) day $ / shares | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jan. 16, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  | $ 0 | $ 114,994,000 | $ 152,250,000 |
Loss on redemption of convertible debt |  |  |  |  | 0 | 0 | 3,044,000 |
Amortized value |  |  |  |  | 366,984,000 | 437,637,000 |  |
Proceeds from issuance of debt |  |  |  |  | $ 0 | $ 3,087,000 | $ 0 |
2013 Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  | $ 265,000,000
Interest rate, stated percentage |  |  |  |  |  |  |  | 2.875%
Repurchased face amount |  |  | $ 150,000,000 |  |  |  |  |
Repayment of debt |  | $ 49,000 | 152,200,000 | $ 115,500,000 |  |  |  |
Repurchased amount |  |  | 148,000,000 |  |  |  |  |
Loss on redemption of convertible debt |  |  | 3,000,000 |  |  |  |  |
Amortized value |  |  | 149,200,000 |  |  |  |  |
Loss on redemption of convertible debt, recovery |  |  | $ 400,000 |  |  |  |  |
Debt conversion | $ 2,000 | $ 4,000 |  |  |  |  |  |
2013 Notes | Senior Notes | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Measurement input |  |  | 0.0495 |  |  |  |  |
2019 Notes | Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  | $ 230,000,000 |  |  |  |  |
Interest rate, stated percentage |  |  | 2.50% |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 222,900,000 |  |  |  |  |
Commissions and expenses related to offering of debt |  |  | $ 7,100,000 |  |  |  |  |
Convertible, conversion ratio |  |  | 0.0541082 |  |  |  |  |
Convertible, conversion price (in dollars per share) | $ / shares |  |  | $ 18.48 |  |  |  |  |
Convertible, threshold trading days | day |  |  | 20 |  |  |  |  |
Convertible, threshold consecutive trading days | day |  |  | 30 |  |  |  |  |
Convertible, threshold percentage of stock price trigger |  |  | 130.00% |  |  |  |  |

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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 + Details
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