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v3.21.1

SUBSEQUENT EVENTS (Details) - USD ($) |  | 1 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 06, 2021 | Apr. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2016
Subsequent Event [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  | $ 169,785,000 | $ 0 | $ 206,000 | $ 236,000 |
Senior Notes | 3.25% Convertible Senior Notes due 2022 |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Principal amount |  |  | $ 250,000,000 | $ 250,000,000 |  |  | $ 250,000,000.0
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Unrestricted cash used for debt repurchase | $ 58,700,000 |  |  |  |  |  |
Subsequent Event | Senior Notes | 2026 Notes, Additional |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Principal amount |  | $ 30,000,000.0 |  |  |  |  |
Proceeds from sale of convertible debt, portion used for debt repurchase |  | $ 25,500,000 |  |  |  |  |
Subsequent Event | Senior Notes | 3.25% Convertible Senior Notes due 2022 |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Repurchased debt outstanding principal amount | 250,000,000.0 |  |  |  |  |  |
Payments for repurchase of debt | $ 4,000,000.0 |  |  |  |  |  |

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- Definition Amount of cash restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6812-107765 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121583591&loc=SL98516268-108586 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 210 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120413173&loc=SL116631458-115580 + Details
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