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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, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Restricted cash |  | $ 900 | $ 1,100 | $ 2,400 | $ 2,300
Fair Value, Recurring [Member] |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents | [1] | 481,391 | 358,818 |  |
Restricted cash | [2] | 949 | 1,102 |  |
Deferred compensation plan assets | [3] | 31,428 | 30,295 |  |
Total |  | 513,768 | 390,215 |  |
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] | 481,391 | 358,818 |  |
Restricted cash | [2] | 949 | 1,102 |  |
Deferred compensation plan assets | [3] | 31,428 | 30,295 |  |
Total |  | 513,768 | 390,215 |  |
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 |  | $ 193,300 | $ 164,000 |  |
[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, 2020 and December 31, 2019, we had $193.3 million and $164.0 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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