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Fair Value Measurements (Schedule Of Assets And Liabilities Carried At Fair Value Measured On A Recurring Basis) (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] $ 443,019 $ 486,831
Restricted cash [2] 3,319 4,232
Deferred compensation plan assets [3] 11,368 7,497
Total 457,706 498,560
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents [1] 443,019 486,831
Restricted cash [2] 3,319 4,232
Deferred compensation plan assets [3] 11,368 7,497
Total 457,706 498,560
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
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] | Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and cash equivalents $ 155,400 $ 151,400
[1] Cash and cash equivalents include money market funds with original maturity dates of three months or less, which are Level 1 assets. At June 30, 2016 and December 31, 2015, we had $155.4 million and $151.4 million, respectively, in money market funds.
[2] Restricted cash is classified as “Prepaid expenses and other” in the Condensed Consolidated Balance Sheets.
[3] Deferred compensation plan assets are classified as "Other assets" in the Condensed Consolidated Balance Sheets.