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Fair Value Measurements - Narrative (Details)	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
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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- Definition

Fixed interest rate related to the interest rate derivative.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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- Details

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