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v3.21.1

Borrowings - Encore Convertible Notes and Exchangeable Notes (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |
Debt issued | $ | $ 422,500 | $ 583,500
Convertible Notes | 2021 Convertible Notes |  |
Debt Instrument [Line Items] |  |
Debt issued | $ | $ 0 | 161,000
Stated interest rate (as a percent) | 2.875% |
Convertible Notes | 2022 Convertible Notes |  |
Debt Instrument [Line Items] |  |
Debt issued | $ | $ 150,000 | 150,000
Stated interest rate (as a percent) | 3.25% |
Initial conversion price (USD per share) | $ 45.57 |
Closing stock price at date of issuance (in dollars per share) | $ 35.05 |
Conversion rate (shares per $1,000 principal amount) | 0.0219467 |
Convertible Notes | 2025 Convertible Notes |  |
Debt Instrument [Line Items] |  |
Debt issued | $ | $ 100,000 | 100,000
Stated interest rate (as a percent) | 3.25% |
Initial conversion price (USD per share) | $ 40.00 |
Closing stock price at date of issuance (in dollars per share) | $ 32.00 |
Conversion rate (shares per $1,000 principal amount) | 0.025 |
Exchangeable Notes | 2023 Exchangeable Notes |  |
Debt Instrument [Line Items] |  |
Debt issued | $ | $ 172,500 | $ 172,500
Stated interest rate (as a percent) | 4.50% |
Initial conversion price (USD per share) | $ 44.62 |
Closing stock price at date of issuance (in dollars per share) | $ 36.45 |
Conversion rate (shares per $1,000 principal amount) | 0.022409 |

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