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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, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Restricted cash $ 2,500 $ 2,000 $ 3,300 $ 2,000
Fair Value, Measurements, Recurring [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents [1] 352,443 467,430    
Restricted cash [2] 2,461 1,958    
Deferred compensation plan assets [3] 25,966 22,054    
Total 380,870 491,442    
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents [1] 352,443 467,430    
Restricted cash [2] 2,461 1,958    
Deferred compensation plan assets [3] 25,966 22,054    
Total 380,870 491,442    
Fair Value, Measurements, 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, Measurements, 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, Measurements, Recurring [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 178,000 $ 194,200    
[1] Cash and cash equivalents include money market funds with original maturity dates of three months or less, which are Level 1 assets. At March 31, 2018 and December 31, 2017, we had $178.0 million and $194.2 million, respectively, in money market funds.
[2] Restricted cash is classified as “Prepaid expenses and other” in the Condensed 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 Condensed Consolidated Balance Sheets.