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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 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Restricted cash |  | $ 1,500 |  |  |  | $ 800 | $ 600
Fair Value, Recurring [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | 840,985 | [1] | $ 789,750 | [2] |  |
Deferred compensation plan assets | [3] | 58,432 |  | 47,315 |  |  |
Restricted cash | [4] | 1,502 |  |  |  |  |
Total |  | 900,919 |  | 837,065 |  |  |
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | 840,985 | [1] | 789,750 | [2] |  |
Deferred compensation plan assets | [3] | 58,432 |  | 47,315 |  |  |
Restricted cash | [4] | 1,502 |  |  |  |  |
Total |  | 900,919 |  | 837,065 |  |  |
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring 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, Recurring [Member] | Level 3 [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring 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 [Member] | Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 528,300 |  | $ 497,300 |  |  |
[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 March 31, 2024, we had $528.3 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, 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.
[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 represents cash held in account for use on customer contracts.

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