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Fair Value Measurements (Schedule Of Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |  |
Restricted cash |  |  |  | $ 600 |  | $ 1,200 | $ 700
Fair Value, Measurements, Recurring |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 789,750 | [1] | 456,439 | [2] |  |
Deferred compensation plan assets | [3] | 47,315 |  | 36,882 |  |  |
Restricted cash | [4] |  |  | 629 |  |  |
Total |  | 837,065 |  | 493,950 |  |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | 789,750 | [1] | 456,439 | [2] |  |
Deferred compensation plan assets | [3] | 47,315 |  | 36,882 |  |  |
Restricted cash | [4] |  |  | 629 |  |  |
Total |  | 837,065 |  | 493,950 |  |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | 0 | [1] | 0 | [2] |  |
Deferred compensation plan assets | [3] | 0 |  | 0 |  |  |
Restricted cash | [4] |  |  | 0 |  |  |
Total |  | 0 |  | 0 |  |  |
Fair Value, Measurements, Recurring | Level 3 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | 0 | [1] | 0 | [2] |  |
Deferred compensation plan assets | [3] | 0 |  | 0 |  |  |
Restricted cash | [4] |  |  | 0 |  |  |
Total |  | 0 |  | 0 |  |  |
Money Market Funds | Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 497,300 |  | $ 209,400 |  |  |
[1] | Cash and cash equivalents consist of deposit accounts and money market funds with original maturity dates of three months or less, which are Level 1 assets. At December 31, 2023, we had $497.3 million in money market funds. From time to time, we have cash balances in certain of our domestic bank accounts that exceed federally insured limits.
[2] | Cash and cash equivalents consist of deposit accounts and money market funds with original maturity dates of three months or less, which are Level 1 assets. At December 31, 2022, we had $209.4 million in money market funds. From time to time, we have cash balances in certain of our domestic bank accounts that exceed federally insured limits.
[3] | Deferred compensation plan assets are classified as “Other assets” in the Consolidated Balance Sheets.
[4] | Restricted cash is classified as “Prepaid expenses and other” in the Consolidated Balance Sheets. Restricted cash primarily represents cash held in account for use on customer contracts.

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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. + References No definition available. + Details
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