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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.