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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 | Jun. 30, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted cash |  |  | $ 600 | $ 1,200 | $ 1,200
Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents | [1] | $ 503,052 | 456,439 |  |
Deferred compensation plan assets | [2] | 45,045 | 36,882 |  |
Restricted cash | [3] |  | 629 |  |
Total |  | 548,097 | 493,950 |  |
Fair Value, Recurring [Member] | Level 1 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents | [1] | 503,052 | 456,439 |  |
Deferred compensation plan assets | [2] | 45,045 | 36,882 |  |
Restricted cash | [3] |  | 629 |  |
Total |  | 548,097 | 493,950 |  |
Fair Value, Recurring [Member] | Level 2 [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents | [1] | 0 | 0 |  |
Deferred compensation plan assets | [2] | 0 | 0 |  |
Restricted cash | [3] |  | 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 | [1] | 0 | 0 |  |
Deferred compensation plan assets | [2] | 0 | 0 |  |
Restricted cash | [3] |  | 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 |  | $ 272,400 | $ 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 June 30, 2023 and December 31, 2022, we had $272.4 million and $209.4 million, respectively, 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] | Deferred compensation plan assets are classified as “Other assets” in the Consolidated Balance Sheets.
[3] | 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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