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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Restricted cash |  | $ 1,100 | $ 2,300 | $ 2,000 | $ 2,000
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 358,818 | 363,907 |  |
Restricted cash |  | 1,102 | 2,307 |  |
Deferred compensation plan assets |  | 30,295 | 23,124 |  |
Total |  | 390,215 | 389,338 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents | [1] | 358,818 | 363,907 |  |
Restricted cash | [2] | 1,102 | 2,307 |  |
Deferred compensation plan assets | [3] | 30,295 | 23,124 |  |
Total |  | 390,215 | 389,338 |  |
Fair Value, Measurements, Recurring | Level 2 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring 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, Measurements, Recurring | Level 3 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring 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 | Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 164,000 | $ 161,300 |  |
[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 December 31, 2019 and 2018, we had $164.0 million and $161.3 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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