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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, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted cash |  | $ 900 | $ 700 | $ 1,000 | $ 1,100
Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents | [1] | 758,833 | 902,867 |  |
Restricted cash | [2] | 924 | 695 |  |
Deferred compensation plan assets | [3] | 42,424 | 36,491 |  |
Total |  | 802,181 | 940,053 |  |
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] | 758,833 | 902,867 |  |
Restricted cash | [2] | 924 | 695 |  |
Deferred compensation plan assets | [3] | 42,424 | 36,491 |  |
Total |  | 802,181 | 940,053 |  |
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 |  |
Restricted cash | [2] | 0 | 0 |  |
Deferred compensation plan assets | [3] | 0 | 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 |  |
Restricted cash | [2] | 0 | 0 |  |
Deferred compensation plan assets | [3] | 0 | 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 |  | $ 396,500 | $ 482,200 |  |
[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, 2021 and December 31, 2020, we had $396.5 million and $482.2 million, respectively, in money market funds.
[2] | 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.
[3] | Deferred compensation plan assets are classified as “Other assets” in the Consolidated Balance Sheets.

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