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SHORT-TERM AND LONG-TERM DEBT (New facilities) (Details) - USD ($) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | May 31, 2018
Debt Instrument [Line Items] |  |  |  |
Repayments of debt | $ 218,977,000 |  |  |
4.875% senior unsecured convertible notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior unsecured convertible notes interest rate (in percentage) | 4.875% | 4.875% |  |
Repayments of debt | $ 2,000,000.0 | $ 6,400,000 | $ 8,400,000 |
5.75% senior unsecured convertible notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior unsecured convertible notes interest rate (in percentage) | 5.75% |  |  |
Repayments of debt | $ 65,300,000 | $ 0 |  |
4.875% senior unsecured convertible notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior unsecured convertible notes interest rate (in percentage) |  |  |  | 4.875%
5.75% senior unsecured convertible notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior unsecured convertible notes interest rate (in percentage) |  |  |  | 5.75%

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