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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, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted cash $ 900 $ 700 $ 900 $ 1,100
Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents [1] 668,908 902,867    
Restricted cash [2] 880 695    
Deferred compensation plan assets [3] 40,320 36,491    
Total 710,108 940,053    
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] 668,908 902,867    
Restricted cash [2] 880 695    
Deferred compensation plan assets [3] 40,320 36,491    
Total 710,108 940,053    
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 $ 366,900 $ 482,200    
[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, 2021 and December 31, 2020, we had $366.9 million and $482.2 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.