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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
Sep. 30, 2023
Dec. 31, 2022
Sep. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted cash   $ 600 $ 1,100 $ 1,200
Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents [1] $ 523,632 456,439    
Deferred compensation plan assets [2] 43,004 36,882    
Restricted cash [3]   629    
Total 566,636 493,950    
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] 523,632 456,439    
Deferred compensation plan assets [2] 43,004 36,882    
Restricted cash [3]   629    
Total 566,636 493,950    
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    
Deferred compensation plan assets [2] 0 0    
Restricted cash [3]   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    
Deferred compensation plan assets [2] 0 0    
Restricted cash [3]   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 $ 361,900 $ 209,400    
[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 September 30, 2023 and December 31, 2022, we had $361.9 million and $209.4 million, respectively, in money market funds. From time to time, we have cash balances in certain of our domestic bank accounts that exceed federally insured limits.
[2] Deferred compensation plan assets are classified as “Other assets” in the Consolidated Balance Sheets.
[3] 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.