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Basis of Presentation and Summary of Significant Accounting Policies - Derivatives (Details) | Jun. 19, 2018 $ / shares | May 22, 2018 $ / shares | Dec. 31, 2018 $ / shares | Aug. 31, 2014 $ / shares
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Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Exercise price of convertible bond hedge (USD per share) |  |  |  | $ 75.05
Convertible Notes | 2023 Convertible Senior Notes |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Common stock price (USD per share) | $ 195.91 | $ 187.09 |  |
Exercise price of convertible bond hedge (USD per share) | 248.48 | 248.48 |  |
Exercise price, warrants (USD per share) | $ 315.38 | $ 315.38 |  |
Convertible Notes | 2023 Convertible Senior Notes | Risk-free interest rate |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input | 0.028 | 0.029 |  |
Convertible Notes | 2023 Convertible Senior Notes | Volatility | Minimum |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input | 0.3 | 0.3 |  |
Convertible Notes | 2023 Convertible Senior Notes | Volatility | Maximum |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input | 0.35 | 0.35 |  |
Convertible Notes | 2023 Convertible Senior Notes | Dividend yield |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input | 0 | 0 |  |
Convertible Notes | 2023 Convertible Senior Notes | Annual coupon rate |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input | 0.0075 | 0.0075 |  |
Convertible Notes | 2023 Convertible Senior Notes | Remaining contractual term (in years) |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input | 4.98 | 5.05 |  |
Convertible Notes | 2019 Convertible Senior Notes |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Common stock price (USD per share) |  | $ 187.09 | $ 135.70 |
Exercise price of convertible bond hedge (USD per share) |  | $ 75.05 | $ 75.05 |
Convertible Notes | 2019 Convertible Senior Notes | Risk-free interest rate |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input |  | 0.0247 | 0.0260 |
Convertible Notes | 2019 Convertible Senior Notes | Volatility | Minimum |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input |  | 0.3 | 0.3 |
Convertible Notes | 2019 Convertible Senior Notes | Volatility | Maximum |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input |  | 0.35 | 0.35 |
Convertible Notes | 2019 Convertible Senior Notes | Dividend yield |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input |  | 0 | 0 |
Convertible Notes | 2019 Convertible Senior Notes | Annual coupon rate |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input |  | 0.0075 | 0.0075 |
Convertible Notes | 2019 Convertible Senior Notes | Remaining contractual term (in years) |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Derivative liability, measurement input |  | 1.25 | 0.63 |

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