Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Fair Value Measurements
Marketable securities	$ 610,450	$ 601,989
Carrying amount of long-term debt	3,201,398	3,109,218
Recurring \| Estimate of Fair Value Measurement
Fair Value Measurements
Marketable securities	610,450	601,989
Cash and cash equivalents	246,001	258,421
Total Assets Measured at Fair Value	856,451	860,410
Cost of cash and cash equivalents and available for sale securities	856,400	860,400
Recurring \| Estimate of Fair Value Measurement \| Corporate Bond Securities
Fair Value Measurements
Marketable securities	170,918	54,673
Recurring \| Estimate of Fair Value Measurement \| Commercial Paper
Fair Value Measurements
Marketable securities	439,532	547,316
Recurring \| Level 1
Fair Value Measurements
Cash and cash equivalents	246,001	258,421
Total Assets Measured at Fair Value	246,001	258,421
Recurring \| Level 2
Fair Value Measurements
Marketable securities	610,450	601,989
Total Assets Measured at Fair Value	610,450	601,989
Fair value of long-term debt	3,200,000	3,200,000
Carrying amount of long-term debt	3,200,000	3,100,000
Recurring \| Level 2 \| Corporate Bond Securities
Fair Value Measurements
Marketable securities	170,918	54,673
Recurring \| Level 2 \| Commercial Paper
Fair Value Measurements
Marketable securities	$ 439,532	$ 547,316

Represents information pertaining to amortized cost of cash and cash equivalents and available for sale securities.

No definition available.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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