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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current Fiscal Year End Date --12-31    
Deferred compensation plan investments $ 80,600 [1] $ 53,600  
Participant Withdrawals From Deferred Compensation Plan Investments 8,300 8,400  
Diversification of share awards within deferred compensation plan (Equity) 25,428 3,557 $ 4,669
Level 1 [Member]      
Deferred compensation plan investments 80,600 53,600  
Level 2 [Member]      
Deferred compensation plan investments 0 0  
Level 3 [Member]      
Deferred compensation plan investments $ 0 $ 0  
[1] Approximately $8.3 million and $8.4 million of participant cash was withdrawn from our deferred compensation plan investments during the years ended December 31, 2016 and 2015, respectively. Approximately $25.4 million and $3.6 million of shares in the compensation plan were diversified into the deferred compensation plan investments during the nine months ended December 31, 2016 and the year ended December 31, 2015, respectively.