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Fair Value Measurements (Details) - USD ($)
$ in Thousands

Dec. 31, 2022

Dec. 31, 2021

Apr. 30, 2021

Dec. 31, 2020

Dec. 31, 2019

Fair Value Measurements [Abstract]

Available-for-sale securities

$ 1,721,391

$ 1,248,124

Equity securities

$ 50,911

$ 50,527

0.125% Notes [Member]

Fair Value Measurements [Abstract]

Interest rate on convertible senior notes

0.125%

0.125%

0.125%

0.125%

0% Notes [Member]

Fair Value Measurements [Abstract]

Interest rate on convertible senior notes

0.00%

0.00%

0.00%

0.00%

Recurring Basis [Member]

Fair Value Measurements [Abstract]

Cash equivalents

^[1]

$ 211,655

$ 541,199

Total

1,943,585

1,807,528

Recurring Basis [Member] | Other Current Assets [Member]

Fair Value Measurements [Abstract]

Equity securities

^[2]

10,539

18,205

Recurring Basis [Member] | Corporate Debt Securities [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

726,950

^[3]

764,059

^[4]

Recurring Basis [Member] | Corporate Debt Securities [Member] | Cash and Cash Equivalents [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

11,000

2,300

Recurring Basis [Member] | Debt Securities Issued by U.S. Government Agencies [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

^[4]

165,055

120,868

Recurring Basis [Member] | Debt Securities Issued by the U.S. Treasury [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

^[4]

748,475

182,634

Recurring Basis [Member] | Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

74,917

^[4]

174,464

^[5]

Recurring Basis [Member] | Other Municipal Debt Securities [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

^[4]

5,994

6,099

Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member]

Fair Value Measurements [Abstract]

Cash equivalents

211,655

541,199

Total

970,669

727,708

Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Other Current Assets [Member]

Fair Value Measurements [Abstract]

Equity securities

10,539

3,875

Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Corporate Debt Securities [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

0

0

Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Debt Securities Issued by U.S. Government Agencies [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

0

0

Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Debt Securities Issued by the U.S. Treasury [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

748,475

182,634

Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

0

0

Recurring Basis [Member] | Quoted Prices in Active Markets (Level 1) [Member] | Other Municipal Debt Securities [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

0

0

Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member]

Fair Value Measurements [Abstract]

Cash equivalents

0

0

Total

972,916

1,065,490

Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 0.125% Notes [Member]

Fair Value Measurements [Abstract]

Fair value of convertible notes

498,900

Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | 0% Notes [Member]

Fair Value Measurements [Abstract]

Fair value of convertible notes

587,300

Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Current Assets [Member]

Fair Value Measurements [Abstract]

Equity securities

0

0

Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

726,950

764,059

Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Securities Issued by U.S. Government Agencies [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

165,055

120,868

Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Securities Issued by the U.S. Treasury [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

0

0

Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

74,917

174,464

Recurring Basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Municipal Debt Securities [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

5,994

6,099

Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member]

Fair Value Measurements [Abstract]

Cash equivalents

0

Total

$ 0

14,330

Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Current Assets [Member]

Fair Value Measurements [Abstract]

Equity securities

14,330

Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Debt Securities [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

0

Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Debt Securities Issued by U.S. Government Agencies [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

0

Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Debt Securities Issued by the U.S. Treasury [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

0

Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Debt Securities Issued by States of the U.S. and Political Subdivisions of the States [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

0

Recurring Basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Municipal Debt Securities [Member]

Fair Value Measurements [Abstract]

Available-for-sale securities

$ 0

[1]	Included in cash and cash equivalents in our consolidated balance sheets.
[2]	Included in other current assets in our consolidated balance sheets.
[3]	$11.0 million included in cash and cash equivalents in our consolidated balance sheets, with the difference included in short-term investments in our consolidated balance sheets.
[4]	Included in short-term investments.
[5]	$2.3 million included in cash and cash equivalents in our consolidated balance sheets, with the difference included in short-term investments in our consolidated balance sheets.

X

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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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