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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Restricted cash |  | $ 2,300 | $ 2,000 | $ 2,000 | $ 4,200
Fair Value, Measurements, Recurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents |  | 363,907 | 467,430 |  |
Restricted cash |  | 2,307 | 1,958 |  |
Deferred compensation plan assets |  | 23,124 | 22,054 |  |
Total |  | 389,338 | 491,442 |  |
Fair Value, Measurements, Recurring | Level 1 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |  |  |
Cash and cash equivalents | [1] | 363,907 | 467,430 |  |
Restricted cash | [2] | 2,307 | 1,958 |  |
Deferred compensation plan assets | [3] | 23,124 | 22,054 |  |
Total |  | 389,338 | 491,442 |  |
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 |  | $ 161,300 | $ 194,200 |  |
[1] | Cash and cash equivalents consist primarily of money market funds with original maturity dates of three months or less, which are Level 1 assets. At December 31, 2018 and 2017, we had $161.3 million and $194.2 million, respectively, in money market funds.
[2] | Restricted cash is classified as “Prepaid expenses and other” in the Consolidated Balance Sheets.
[3] | Deferred compensation plan assets are classified as “Other assets” in the Consolidated Balance Sheets.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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