Capped call options cap price.

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Cost of purchased capped call options.

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Debt instrument, convertible shares, per thousand of principal amount of notes.

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Debt instruments maturity year.

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Debt issuance costs attributable to equity component.

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Description of convertible notes at option of holders.

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Notes measurement period.

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- Definition

Partially terminated capped call options.

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No definition available.

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Principal amount per note used in conversion rate.

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Amount of increase (decrease) in additional paid in capital (APIC) resulting from recognition of deferred taxes for convertible debt with a beneficial conversion feature.

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Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital.

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Amount of decrease in additional paid in capital (APIC) resulting from direct costs associated with issuing stock. Includes, but is not limited to, legal and accounting fees and direct costs associated with stock issues under a shelf registration.

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The number of shares issued in exchange for the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or payments in the period.

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

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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.

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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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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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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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Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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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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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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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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Face (par) amount of the original debt instrument that was repurchased.

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No definition available.

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Amount, after accumulated amortization, of debt discount.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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

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No definition available.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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Convertible Senior Notes - Additional Information (Details)			1 Months Ended		6 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) $ / shares	Nov. 30, 2017 USD ($) $ / shares	Dec. 31, 2019 USD ($) $ / shares shares	Nov. 30, 2017 USD ($) $ / shares shares	Jun. 30, 2018 d	Dec. 31, 2020 USD ($) d $ / shares shares	Dec. 31, 2019 USD ($) $ / shares
Debt Instrument [Line Items]
Loss on extinguishment of convertible notes						$ 446,000	$ 1,406,000
0.125% Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Aggregate principal amount	$ 450,000,000		$ 450,000,000			$ 450,000,000	$ 450,000,000
Debt instrument, interest rate	0.125%		0.125%			0.125%	0.125%
Debt instrument, maturity date			Dec. 15, 2024
Debt instrument, interest rate terms						Interest is payable semiannually in arrears on June 15 and December 15 of each year, commencing on June 15, 2020.
Interest payment commencing date			Jun. 15, 2020
Debt Conversion, initial conversion rate \| shares			8.8999
Principal amount per note used in conversion rate			$ 1,000				$ 1,000
Conversion price per share \| $ / shares			$ 112.36				$ 112.36
Shares issuable upon conversion of debt \| shares			4,000,000.0
Number of trading days \| d						20
Number of consecutive trading days \| d						30
Percentage of last reported sale price to conversion price on each applicable trading day						130.00%
Description of convertible notes at option of holders						On or after June 15, 2024 until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their 2024 Notes at the conversion rate at any time regardless of whether the conditions set forth below have been met.
Redemption price, percentage						100.00%
Implied interest rate	5.16%					5.16%
Debt instrument, fair value			$ 360,400,000				$ 360,400,000
Difference between aggregate principal amount and estimated fair value of liability component recorded in additional paid-in capital						$ 89,600,000
Transaction costs attributable to liability component			10,200,000				10,200,000
Transaction costs attributable to equity component			2,600,000				2,600,000
Initial strike price of capped call options \| $ / shares						$ 112.36
Capped call options, cap price \| $ / shares						$ 166.46
Cost of purchased capped call options			44,900,000			$ 44,900,000
Share price \| $ / shares	$ 149.07					$ 149.07
Debt instrument, maturity year						2024
Debt issuance cost	$ 80,968,000		98,942,000			$ 80,968,000	98,942,000
0.125% Convertible Senior Notes Due 2024 \| Scenario One
Debt Instrument [Line Items]
Number of trading days \| d						20
Number of consecutive trading days \| d						30
Percentage of last reported sale price to conversion price on each applicable trading day						130.00%
0.125% Convertible Senior Notes Due 2024 \| Scenario Two
Debt Instrument [Line Items]
Number of consecutive trading days \| d						10
Percentage of last reported sale price to conversion price on each applicable trading day						98.00%
Notes measurement period						5 days
0.125% Convertible Senior Notes Due 2024 \| Option to Purchase
Debt Instrument [Line Items]
Aggregate principal amount			75,000,000.0				75,000,000.0
1.50% Convertible Senior Notes Due 2022
Debt Instrument [Line Items]
Aggregate principal amount	$ 79,795,000	$ 115,000,000.0	$ 92,000,000	$ 115,000,000.0		$ 79,795,000	$ 92,000,000
Debt instrument, interest rate	1.50%	1.50%	1.50%	1.50%		1.50%	1.50%
Debt instrument, maturity date				Nov. 01, 2022
Debt instrument, interest rate terms						Interest is payable semiannually in arrears on May 1 and November 1 of each year, commencing on May 1, 2018.
Interest payment commencing date				May 01, 2018
Debt Conversion, initial conversion rate \| shares				29.6626
Principal amount per note used in conversion rate		$ 1,000		$ 1,000
Conversion price per share \| $ / shares		$ 33.71		$ 33.71
Shares issuable upon conversion of debt \| shares				3,400,000
Number of trading days \| d					30	20
Number of consecutive trading days \| d						30
Percentage of last reported sale price to conversion price on each applicable trading day						130.00%
Description of convertible notes at option of holders						On or after May 1, 2022, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert all or any portion of their 2022 Notes at the conversion rate at any time regardless of whether the conditions set forth below have been met.
Redemption price, percentage						100.00%
Implied interest rate	6.93%					6.93%
Debt instrument, fair value		$ 92,100,000		$ 92,100,000
Difference between aggregate principal amount and estimated fair value of liability component recorded in additional paid-in capital		22,900,000
Transaction costs attributable to liability component		2,200,000		2,200,000
Transaction costs attributable to equity component		800,000		800,000
Initial strike price of capped call options \| $ / shares						$ 33.71
Capped call options, cap price \| $ / shares						47.20
Cost of purchased capped call options				12,900,000
Share price \| $ / shares	$ 149.07					$ 149.07
Debt instrument, maturity year						2022
Debt issuance cost	$ 7,313,000		$ 12,776,000			$ 7,313,000	$ 12,776,000
1.50% Convertible Senior Notes Due 2022 \| Scenario One
Debt Instrument [Line Items]
Number of trading days \| d						20
Number of consecutive trading days \| d						30
Percentage of last reported sale price to conversion price on each applicable trading day						130.00%
1.50% Convertible Senior Notes Due 2022 \| Scenario Two
Debt Instrument [Line Items]
Number of consecutive trading days \| d						5
Percentage of last reported sale price to conversion price on each applicable trading day						98.00%
Notes measurement period						5 days
1.50% Convertible Senior Notes Due 2022 \| Option to Purchase
Debt Instrument [Line Items]
Aggregate principal amount		$ 15,000,000.0		$ 15,000,000.0
1.50% Convertible Senior Notes Due 2022 Repurchase
Debt Instrument [Line Items]
Debt Conversion, initial conversion rate \| shares						362,029
Principal amount per note used in conversion rate	12,200,000					$ 12,200,000
Implied interest rate			4.64%				4.64%
Repayments of debt							$ 57,800,000
Repurchase of aggregate principal amount			$ 23,000,000.0				23,000,000.0
Loss on extinguishment of convertible notes	$ 100,000					400,000	1,400,000
Remaining consideration allocated to reacquisition of equity component							36,700,000
Partially terminated capped call options							$ 5,800,000
Additional paid-in capital related to shares issued						$ 11,400,000
1.50% Convertible Senior Notes Due 2022 Repurchase \| Minimum
Debt Instrument [Line Items]
Implied interest rate	4.64%					4.64%
1.50% Convertible Senior Notes Due 2022 Repurchase \| Maximum
Debt Instrument [Line Items]
Implied interest rate	5.13%					5.13%