Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Option Indexed To Issuer's Equity

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Debt Instrument, Convertible, Issuance Costs of Equity Component

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Debt Issuance Costs, Net, Liability Component

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Option Indexed to Issuers' Equity, Cap Price

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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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

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

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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.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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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.

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

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

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

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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.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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

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The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract.

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Exercise or strike price stated in the contract for options indexed to the issuer's equity shares.

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The cash inflow from the issuance of a long-term debt 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.

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Convertible Senior Notes and Capped Calls - Additional Information (Details) $ / shares in Units, shares in Millions	1 Months Ended	3 Months Ended
	Aug. 31, 2018 USD ($) day $ / shares shares	Mar. 31, 2020 USD ($) $ / shares	Dec. 31, 2019 USD ($)
Call Option [Member]
Debt Instrument [Line Items]
Strike price (in dollars per share) \| $ / shares	$ 41.59
Cap price (in dollars per share) \| $ / shares	$ 63.98
Option indexed to issuer's equity (in shares) \| shares	5.5
Equity component of convertible debt, subsequent adjustments		$ 26,900,000
The Notes, Due 2023 [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Face amount	$ 200,000,000.0
Interest rate		1.25%
The Notes, Over-allotment Options [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Face amount	30,000,000.0
The Notes [Member]
Debt Instrument [Line Items]
Strike price (in dollars per share) \| $ / shares		$ 41.59
Equity component of convertible debt, subsequent adjustments	$ 26,910,000
The Notes [Member] \| Convertible Debt [Member]
Debt Instrument [Line Items]
Interest rate	1.25%
Proceeds from convertible debt	$ 223,100,000
Conversion ratio (in shares per $1000)	0.024046
Conversion price (in dollars per share) \| $ / shares	$ 41.59
Carrying amount of equity component	$ 53,800,000	$ 52,194,000	$ 52,194,000
Converted instrument, rate	7.36%
Debt issuance costs, net	$ 6,900,000	$ 3,785,000	$ 4,032,000
Liability component	5,300,000
Issuance costs of equity component	$ 1,600,000
The Notes [Member] \| Convertible Debt [Member] \| Debt Covenant One [Member]
Debt Instrument [Line Items]
Threshold trading days \| day	20
Threshold consecutive trading days \| day	30
Threshold percentage of stock price trigger	130.00%
The Notes [Member] \| Convertible Debt [Member] \| Debt Covenant Two [Member]
Debt Instrument [Line Items]
Threshold trading days \| day	5
Threshold percentage of stock price trigger	98.00%
The Notes [Member] \| Convertible Debt [Member] \| Debt Covenant Three [Member]
Debt Instrument [Line Items]
Threshold trading days \| day	20
Threshold consecutive trading days \| day	30
Threshold percentage of stock price trigger	130.00%
Redemption price, percentage	100.00%