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v3.19.1

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

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