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v3.20.4

DEBT (Convertible Senior Notes) (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 24, 2020 USD ($) day $ / shares Rate shares | May 31, 2017 USD ($) day segment $ / shares Rate shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) Rate | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Repayments of convertible debt |  |  |  | $ 233,862,000 | $ 0 | $ 0
Amortization of convertible debt discount |  |  |  | 19,570,000 | 12,016,000 | 11,397,000
Amortization of debt issuance costs |  |  |  | 3,474,000 | 1,974,000 | 1,776,000
Debt Issuance Costs, Net [Abstract] |  |  |  |  |  |
Net carrying amount |  |  |  | $ 611,412,000 | 264,391,000 |
2025 Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate | 0.50% |  |  | 0.50% |  |
Conversion rate, number of shares per $1,000 of principal | shares | 2.1683 |  |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 461.19 |  |  |  |  |
Threshold percentage of stock price trigger | Rate | 130.00% |  |  | 130.00% |  |
Redemption percentage | Rate | 100.00% |  |  |  |  |
Nonconvertible debt borrowing rate at the date of issuance | Rate | 5.30% |  |  |  |  |
Convertible debt, noncurrent | $ 455,600,000 |  |  |  |  |
Carrying amount of debt, equity component | 119,400,000 |  |  |  |  |
Debt issuance costs, gross | 15,100,000 |  |  |  |  |
Debt issuance costs, liability component | 12,000,000.0 |  |  | $ 11,056,000 |  |
Debt issuance costs, equity component | $ 3,100,000 |  |  |  |  |
Interest expense |  |  |  | 11,500,000 |  |
Interest expense, excluding amortization |  |  |  | $ 1,300,000 |  |
Interest rate | 0.50% |  |  | 0.50% |  |
Amortization of convertible debt discount |  |  |  | $ 9,300,000 |  |
Amortization of debt issuance costs |  |  |  | 900,000 |  |
Debt Issuance Costs, Net [Abstract] |  |  |  |  |  |
Gross carrying amount |  |  |  | 575,000,000 |  |
Unamortized debt discount |  |  |  | 110,110,000 |  |
Debt issuance costs | $ 12,000,000.0 |  |  | 11,056,000 |  |
Net carrying amount |  |  |  | 453,834,000 |  |
2025 Convertible Notes | Conversion option one |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold trading days | day | 20 |  |  |  |  |
Threshold consecutive trading days | day | 30 |  |  |  |  |
Threshold percentage of stock price trigger | Rate | 130.00% |  |  |  |  |
2025 Convertible Notes | Conversion option two |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold trading days | day | 5 |  |  |  |  |
Threshold consecutive trading days | day | 5 |  |  |  |  |
Threshold percentage of stock price trigger | Rate | 98.00% |  |  |  |  |
2025 Convertible Notes | Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ 575,000,000.0 |  |  |  |  |
Interest rate | Rate | 0.50% |  |  |  |  |
Long-term debt, fair value |  |  |  | $ 564,100,000 |  |
2025 Notes Under 13-day Purchase Option | Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount | $ 75,000,000.0 |  |  |  |  |
2022 Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate principal amount |  | $ 300,000,000.0 |  |  |  |
Interest rate |  | 0.625% |  | 0.625% |  |
Conversion rate, number of shares per $1,000 of principal | shares |  | 4.8163 |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 207.63 |  |  |  |
Threshold percentage of stock price trigger |  | 130.00% |  |  |  |
Redemption percentage |  | 100.00% |  |  |  |
Nonconvertible debt borrowing rate at the date of issuance |  | 5.36% |  |  |  |
Convertible debt, noncurrent |  | $ 238,400,000 |  |  |  |
Carrying amount of debt, equity component |  | 61,600,000 |  |  |  |
Debt issuance costs, gross |  | 9,300,000 |  |  |  |
Debt issuance costs, liability component |  | 7,400,000 |  | $ 1,297,000 | 3,811,000 |
Debt issuance costs, equity component |  | 1,900,000 |  |  |  |
Repayments of convertible debt | 234,000,000.0 |  |  |  |  |
Repurchased face amount | 130,300,000 |  |  |  |  |
Repurchased amount, accrued interest | 100,000 |  |  |  |  |
Extinguishment of debt | 126,000,000.0 |  |  |  |  |
Repurchase of convertible debt, reduction to additional paid-in capital | $ 107,900,000 |  |  | (107,882,000) |  |
Loss on extinguishment of debt |  |  | $ 7,800,000 |  |  |
Interest expense |  |  |  | 13,000,000.0 | 15,300,000 | 14,600,000
Interest expense, excluding amortization |  |  |  | $ 1,500,000 | $ 1,900,000 | $ 1,900,000
Interest rate |  |  |  | 0.625% | 0.625% | 0.625%
Amortization of convertible debt discount |  |  |  | $ 10,300,000 | $ 12,000,000.0 | $ 11,400,000
Amortization of debt issuance costs |  |  |  | 1,200,000 | 1,400,000 | $ 1,300,000
Long-term debt, fair value |  |  |  | 243,800,000 |  |
Debt Issuance Costs, Net [Abstract] |  |  |  |  |  |
Gross carrying amount |  |  |  | 169,690,000 | 299,991,000 |
Unamortized debt discount |  |  |  | 10,815,000 | 31,789,000 |
Debt issuance costs |  | $ 7,400,000 |  | 1,297,000 | 3,811,000 |
Net carrying amount |  |  |  | $ 157,578,000 | $ 264,391,000 |
2022 Convertible Notes | Conversion option one |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold trading days | day |  | 20 |  |  |  |
Threshold consecutive trading days | segment |  | 30 |  |  |  |
Threshold percentage of stock price trigger |  | 130.00% |  |  |  |
2022 Convertible Notes | Conversion option two |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold trading days | day |  | 5 |  |  |  |
Threshold percentage of stock price trigger |  | 98.00% |  |  |  |

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