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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Deferred compensation plan investments (1) $ 120,600 [1]   $ 120,300
Participant Withdrawals From Deferred Compensation Plan Investments 3,300 $ 4,200  
Diversification of share awards within deferred compensation plan 951 $ 2,627 23,200
Interest Rate Derivative Assets, at Fair Value 10,500   2,200
Interest Rate Derivative Liabilities, at Fair Value 0   500
Level 1 [Member]      
Deferred compensation plan investments (1) 120,600 [1]   120,300
Interest Rate Derivative Assets, at Fair Value 0   0
Interest Rate Derivative Liabilities, at Fair Value 0   0
Level 2 [Member]      
Deferred compensation plan investments (1) 0 [1]   0
Level 3 [Member]      
Deferred compensation plan investments (1) 0 [1]   0
Interest Rate Derivative Assets, at Fair Value 0   0
Interest Rate Derivative Liabilities, at Fair Value 0   0
Interest Rate Swap [Member]      
Interest Rate Derivative Assets, at Fair Value 10,500   2,200
Interest Rate Derivative Liabilities, at Fair Value 0   500
Interest Rate Swap [Member] | Level 2 [Member]      
Interest Rate Derivative Assets, at Fair Value 10,500   2,200
Interest Rate Derivative Liabilities, at Fair Value $ 0   $ 500
[1] Approximately $3.3 million and $4.2 million of participant cash was withdrawn from our deferred compensation plan investments during the six months ended June 30, 2018 and the year ended December 31, 2017, respectively. Approximately $1.0 million and $23.2 million of participant restricted share units in the compensation plan were diversified into deferred compensation plan investments during the six months ended June 30, 2018 and the year ended December 31, 2017, respectively.