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Fair Value Measurements - Narrative (Details) | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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1.125% Call Option |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of contractual interest rate on derivative | 1.125% | 1.125% | 1.125%
1.125% Conversion Option |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Percentage of contractual interest rate on derivative | 1.125% |  | 1.125%

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