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

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Option Indexed to Issuers' Equity, Cap Price

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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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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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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No definition available.

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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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No definition available.

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

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Amount of the fee that accompanies borrowing money under the debt instrument.

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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 carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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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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Debt - Additional Information (Details) $ / shares in Units, shares in Millions			1 Months Ended	9 Months Ended
	May 01, 2020 USD ($) $ / shares shares	Apr. 23, 2020 USD ($)	Aug. 31, 2018 USD ($) day $ / shares shares	Sep. 30, 2020 USD ($) $ / shares	Sep. 30, 2019 USD ($)	May 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Proceeds from convertible debt				$ 222,799,000	$ 0
Convertible Debt
Debt Instrument [Line Items]
Carrying amount of equity component				99,026,000			$ 99,026,000
Debt issuance costs, net				$ 8,569,000
Convertible Debt \| Debt Covenant One
Debt Instrument [Line Items]
Threshold trading days \| day			20
Threshold consecutive trading days \| day			30
Threshold percentage of stock price trigger			130.00%
Convertible Debt \| Debt Covenant Two
Debt Instrument [Line Items]
Threshold trading days \| day			5
Threshold percentage of stock price trigger			98.00%
Convertible Debt \| Debt Covenant Three
Debt Instrument [Line Items]
Threshold percentage of stock price trigger			130.00%
Redemption price, percentage			100.00%
2023 Notes
Debt Instrument [Line Items]
Strike price (in dollars per share) \| $ / shares				$ 41.59
Equity component of convertible debt, subsequent adjustments			$ 26,910,000
2023 Notes \| Call Option
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
2023 Notes \| Convertible Debt
Debt Instrument [Line Items]
Face amount			$ 230,000,000.0
Interest rate			1.25%	1.25%
Proceeds from convertible debt			$ 223,100,000
Carrying amount of equity component			53,800,000	$ 52,194,000			52,194,000
Debt issuance costs, net			6,900,000	$ 3,274,000			4,032,000
Liability component			5,300,000
Issuance costs of equity component			$ 1,600,000
Converted instrument, rate			7.36%
2023 Notes \| Convertible Debt \| Call Option
Debt Instrument [Line Items]
Option indexed to issuer's equity (in shares) \| shares			5.5
2023 Notes \| Convertible Debt \| Debt Covenant Three
Debt Instrument [Line Items]
Threshold trading days \| day			20
Threshold consecutive trading days \| day			30
Redemption price, percentage			100.00%
2025 Notes
Debt Instrument [Line Items]
Strike price (in dollars per share) \| $ / shares				$ 61.02
Equity component of convertible debt, subsequent adjustments	$ 27,255,000
2025 Notes \| Call Option
Debt Instrument [Line Items]
Strike price (in dollars per share) \| $ / shares	$ 61.02
Cap price (in dollars per share) \| $ / shares	$ 93.88
Option indexed to issuer's equity (in shares) \| shares	3.8
Equity component of convertible debt, subsequent adjustments	$ 27,300,000
2025 Notes \| Convertible Debt
Debt Instrument [Line Items]
Face amount			$ 230,000,000.0
Interest rate			2.25%	2.25%
Proceeds from convertible debt			$ 222,800,000
Carrying amount of equity component	48,300,000			$ 46,832,000			$ 46,832,000
Debt issuance costs, net	7,200,000			5,295,000
Liability component	5,700,000
Issuance costs of equity component	$ 1,500,000
Converted instrument, rate			7.85%
2025 Notes \| Convertible Debt \| Call Option
Debt Instrument [Line Items]
Option indexed to issuer's equity (in shares) \| shares			3.8
Credit Agreement
Debt Instrument [Line Items]
Long-term line of credit				$ 0
Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Current borrowing capacity		$ 30,000,000.0				$ 50,000,000.0
Credit sublimit		15,000,000.0
Fee amount		$ 400,000
Commitment fee percentage		0.20%
Credit Agreement \| Letter of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 70,000,000.0
Credit Agreement \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate		2.50%
Credit Agreement \| London Interbank Offered Rate (LIBOR) \| Minimum
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Credit Agreement \| Base Rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%