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Fair Value Measurements (Schedule Of Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | [1] | $ 480,496 | $ 464,617
Restricted cash | [2] | 2,082 | 2,043
Deferred compensation plan assets | [3] | 20,372 | 12,153
Total |  | 502,950 | 478,813
Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents | [1] | 480,496 | 464,617
Restricted cash | [2] | 2,082 | 2,043
Deferred compensation plan assets | [3] | 20,372 | 12,153
Total |  | 502,950 | 478,813
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
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] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Cash and cash equivalents |  | $ 187,000 | $ 154,600
[1] | Cash and cash equivalents include money market funds with original maturity dates of three months or less, which are Level 1 assets. At September 30, 2017 and December 31, 2016, we had $187.0 million and $154.6 million, respectively, in money market funds.
[2] | Restricted cash is classified as “Prepaid expenses and other” in the Condensed Consolidated Balance Sheets.
[3] | Deferred compensation plan assets are classified as “Other assets” in the Condensed Consolidated Balance Sheets.

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