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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) | Dec. 31, 2021 | Jan. 07, 2021 | Dec. 31, 2020 | May 31, 2020 | May 29, 2020 | May 18, 2020 | Mar. 31, 2018
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3.75% Convertible Senior Notes |  |  |  |  |  |  |
Interest rate (as a percent) | 3.75% |  | 3.75% | 3.75% | 3.75% | 3.75% | 3.75%
5.5% Convertible Senior Notes |  |  |  |  |  |  |
Interest rate (as a percent) | 5.50% | 5.50% | 5.50% |  |  |  | 5.50%

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