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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
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted cash $ 800 $ 600 $ 1,400 $ 1,200
Fair Value, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents [1] 420,075 456,439    
Restricted cash [2] 750 629    
Deferred compensation plan assets [3] 43,349 36,882    
Total 464,174 493,950    
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] 420,075 456,439    
Restricted cash [2] 750 629    
Deferred compensation plan assets [3] 43,349 36,882    
Total 464,174 493,950    
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    
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 $ 173,400 $ 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 March 31, 2023 and December 31, 2022, we had $173.4 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] 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.