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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 - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Cash and cash equivalents |  | $ 464,617 | $ 486,831
Restricted cash |  | 2,043 | 4,232
Deferred compensation plan assets |  | 12,153 | 7,497
Total |  | 478,813 | 498,560
Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Cash and cash equivalents | [1] | 464,617 | 486,831
Restricted cash | [2] | 2,043 | 4,232
Deferred compensation plan assets | [3] | 12,153 | 7,497
Total |  | 478,813 | 498,560
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
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 | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |  |
Cash and cash equivalents |  | $ 154,600 | $ 151,400
[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, 2016 and 2015, we had $154.6 million and $151.4 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 The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against short-term borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. For a classified balance sheet represents the current portion only (the noncurrent portion has a separate concept); there is a separate and distinct element for unclassified presentations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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