Applicable Conversion Price, Percentage

No definition available.

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- Definition

Applicable Conversion Price Threshold, Percentage

+ References

No definition available.

+ Details

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- Definition

Maximum Days After Any Five Trading Day Period In Which Trading Price Was Less Than 97 Percent Of Last Reported Sale Price of Common Stock Times Conversion Rate

+ References

No definition available.

+ Details

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- Definition

Net Cost Of Convertible Note Hedge And Warrants

+ References

No definition available.

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- Definition

Payments For Call Options Related to Convertible Debt

+ References

No definition available.

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- Definition

Percentage Above Sales Price

+ References

No definition available.

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- Definition

Premium Percentage On Shares Issued from Conversion of Convertible Debt

+ References

No definition available.

+ Details

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- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(2))
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- Definition

The portion of the carrying value of long-term convertible debt as of the balance sheet date that is scheduled to be repaid within one year or in the normal operating cycle if longer. Convertible debt is a financial instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

+ References

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-Topic 210
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-Section S99
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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-Topic 470
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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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- Definition

The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

+ References

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- Definition

Price of the entity's common stock which would be required to be attained for the conversion feature embedded in the debt instrument to become effective.

+ References

No definition available.

+ Details

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- Definition

Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

+ References

No definition available.

+ Details

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- Definition

Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature.

+ References

No definition available.

+ Details

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- Definition

Face (par) amount of debt instrument at time of issuance.

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- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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-Name Accounting Standards Codification
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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-Topic 210
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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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- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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- Definition

The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt).

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Details

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- Details

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Debt and Credit Arrangements - 2024 Notes Narratives (Details) $ / shares in Units, shares in Thousands		1 Months Ended	3 Months Ended
	Nov. 06, 2017 USD ($) $ / shares	Dec. 31, 2017 USD ($) $ / shares shares	Mar. 31, 2019 USD ($) day $ / shares	Dec. 31, 2018 USD ($)	Oct. 31, 2017 $ / shares
Common Stock
Debt Instrument
Share price (usd per share) \| $ / shares			$ 90.52
Convertible Debt \| Convertible Notes, due 2024
Debt Instrument
Debt instrument stated interest rate (percent)	1.00%
Debt instrument face amount	$ 258,800,000.0		$ 258,800,000	$ 258,800,000
Share conversion rate	0.0170285
Debt instrument, conversion price (usd per share) \| $ / shares	$ 58.725
Debt instrument, conversion premium	35.00%
Share price (usd per share) \| $ / shares					$ 43.50
Debt instrument, excess over fair value if converted			$ 140,100,000
Debt instrument, threshold for consecutive trading days \| day			20
Debt instrument, threshold for consecutive trading days \| day			30
Applicable conversion price threshold (as percentage)			130.00%
Maximum days after five trading days			5 days
Applicable conversion price, less than (as percentage)			97.00%
Debt instrument strike price (usd per share) \| $ / shares			$ 76.3425
Convertible debt, current			$ 210,300,000
Debt instrument effective interest rate	4.80%
Non cash payment for derivative instrument		$ 59,500,000
Number of shares underlying warrant \| shares		4,410
Proceeds from issuances of warrants		$ 46,000,000
Percentage above previous sales price		65.00%
Net cost of convertible note hedge and warrant		$ 13,500,000
Convertible Debt \| Convertible Notes, due 2024 \| Maximum
Debt Instrument
Debt instrument, conversion price (usd per share) \| $ / shares		$ 71.775
Convertible Debt \| Convertible Notes, due 2024 \| Liability Component
Debt Instrument
Debt instrument face amount	$ 200,100,000
Debt issuance costs	5,300,000
Convertible Debt \| Convertible Notes, due 2024 \| Equity Component
Debt Instrument
Debt instrument face amount	$ 58,700,000
Debt issuance costs			$ 1,500,000