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Debt - Additional Information Related to Senior and Convertible Notes (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Oct. 07, 2020 | Nov. 15, 2019 | Jun. 10, 2014
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | $ 1,191,276 |  |  |  |
Less: Unamortized discount | (91,593) | $ (112,798) |  |  |
Deferred issuance costs | (9,056) | (11,505) |  |  |
Total debt | 1,090,627 | 1,579,021 |  |  |
Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | 1,191,276 | 1,702,414 |  |  |
4.625% Senior Notes Due in 2030 | Senior Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount | 641,276 | 750,000 | $ 750,000 |  |
Less: Unamortized discount | (4,259) |  |  |  |
Deferred issuance costs | (1,339) |  |  |  |
Total debt | 635,678 |  |  |  |
3.25% Convertible Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Additional paid-in capital | 0 | 37,688 |  |  | $ 37,700
Principal amount | 0 | 402,414 |  |  |
Less: Unamortized discount | 0 | (4,644) |  |  | $ (59,000)
Deferred issuance costs | 0 | (855) |  |  |
Total debt | 0 | 396,915 |  |  |
1.75% Convertible Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Additional paid-in capital | 88,138 | 88,138 |  | $ 88,100 |
Principal amount | 550,000 | 550,000 |  |  |
Less: Unamortized discount | (87,334) | (102,631) |  | (118,900) |
Deferred issuance costs | (7,717) | (8,889) |  | $ (2,800) |
Total debt | $ 454,949 | $ 438,480 |  |  |

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