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Debt - Narrative (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2018 shares	Jun. 30, 2018 shares	Mar. 31, 2018 shares	Sep. 30, 2019 item
Convertible Notes
Common stock issued in exchange of notes (in shares) | shares	38	38	539
Convertible Senior Notes 0.375 Percent Due 2018 and Convertible Senior Notes 1.25 Percent Due 2020
Convertible Notes
Number of days within 30 consecutive trading days in which the price of the entity's common stock must exceed the conversion price for the notes to be converted				20 days
Number of consecutive trading days during which the closing price of the entity's common stock must exceed the conversion price for at least 20 days in order for the notes to be convertible				30 days
Percentage of the closing sales price of common stock that the conversion price must exceed in order for the notes to be convertible (as a percent)				130.00%
Number of consecutive business days immediately after any five consecutive trading day period during the note measurement period				5
Number of consecutive trading days before five consecutive business days during the note measurement period				5
Conversion ratio, principal amount of note				1,000
Percentage of the trading price to the product of the last reported sale price of the common stock and the conversion rate, maximum (as a percent)				98.00%

X

- Definition

Represents the percentage of the closing sales price of the common stock for at least 20 days within 30 consecutive trading days that the closing sales price of the common stock must exceed the conversion price in order for the debt instruments to be convertible.

+ References

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- Definition

Represents the number of trading days within a period of 30 consecutive trading days the price of the entity's common stock must exceed the applicable conversion price in order for the debt instruments to be convertible.

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- Definition

Represents the number of consecutive business days immediately after any five consecutive trading day period during the debt instrument measurement period.

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- Definition

Represents the number of consecutive trading days during which the closing price of the entity's common stock must exceed the applicable conversion price for at least 20 days in order for the debt instruments to be convertible.

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Represents the number of consecutive trading days prior to the five consecutive business days during the debt instrument measurement period.

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- Definition

Represents the maximum percentage of the trading price of each debt instrument to the product of the last reported sale price of common stock and the conversion rate of the debt instrument that the trading price must be less than in order for the debt instruments to be convertible.

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- Definition

Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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