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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Restricted cash   $ 600 $ 1,200 $ 700
Fair Value, Measurements, Recurring        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash and cash equivalents $ 789,750 [1] 456,439 [2]    
Deferred compensation plan assets [3] 47,315 36,882    
Restricted cash [4]   629    
Total 837,065 493,950    
Fair Value, Measurements, Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash and cash equivalents 789,750 [1] 456,439 [2]    
Deferred compensation plan assets [3] 47,315 36,882    
Restricted cash [4]   629    
Total 837,065 493,950    
Fair Value, Measurements, Recurring | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]        
Cash and cash equivalents 0 [1] 0 [2]    
Deferred compensation plan assets [3] 0 0    
Restricted cash [4]   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 0 [1] 0 [2]    
Deferred compensation plan assets [3] 0 0    
Restricted cash [4]   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 $ 497,300 $ 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 December 31, 2023, we had $497.3 million 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] 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, 2022, we had $209.4 million in money market funds. From time to time, we have cash balances in certain of our domestic bank accounts that exceed federally insured limits.
[3] Deferred compensation plan assets are classified as “Other assets” in the Consolidated Balance Sheets.
[4] 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.