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FINANCING ARRANGEMENTS - 1.125% Convertible Senior Notes due 2026 (Details) | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Apr. 30, 2021 USD ($) $ / shares | Mar. 31, 2021 USD ($) $ / shares | Apr. 30, 2016 | Dec. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Restricted cash - non-current |  | $ 169,785,000 |  | $ 0 | $ 206,000 | $ 236,000
Share price (in usd per share) | $ / shares |  | $ 50.55 |  |  |  |
1.125% Convertible Senior Notes due 2026 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate |  | 1.125% |  |  |  |
Principal amount |  | $ 200,000,000.0 |  |  |  |
Net proceeds from issuance of debt |  | 193,000,000.0 |  |  |  |
Proceeds from debt used for capped call transactions payment |  | 23,800,000 |  |  |  |
Restricted cash - non-current |  | $ 169,800,000 |  |  |  |
Debt conversion ratio |  |  | 0.0146800 |  |  |
Conversion price (in usd per share) | $ / shares |  | $ 68.12 |  |  |  |
Debt related commitment fees and issuance costs |  | $ 6,800,000 |  |  |  |
Effective interest rate |  | 1.84% |  |  |  |
Fair value of debt |  | $ 205,400,000 |  |  |  |
Debt conversion price, premium on stock price |  | 100.00% |  |  |  |
1.125% Convertible Senior Notes due 2026 | Senior Notes | Subsequent Event | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Conversion price (in usd per share) | $ / shares | $ 104.80 |  |  |  |  |
2026 Notes, Additional | Senior Notes | Subsequent Event |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount | $ 30,000,000.0 |  |  |  |  |
Net proceeds from issuance of debt | 29,100,000 |  |  |  |  |
Proceeds from debt used for capped call transactions payment | $ 3,600,000 |  |  |  |  |

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