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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Deferred compensation plan investments | $ 120,300 | [1] | $ 80,600 |
Participant Withdrawals From Deferred Compensation Plan Investments | 4,200 |  | 8,300 |
Diversification of share awards within deferred compensation plan (Equity) | 23,233 |  | 25,428 | $ 3,557
Interest Rate Derivative Assets, at Fair Value | 2,200 |  | 0 |
Interest Rate Derivative Liabilities, at Fair Value | 500 |  | 0 |
Level 1 [Member] |  |  |  |
Deferred compensation plan investments | 120,300 |  | 80,600 |
Interest Rate Derivative Assets, at Fair Value | 0 |  | 0 |
Interest Rate Derivative Liabilities, at Fair Value | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Deferred compensation plan investments | 0 |  | 0 |
Level 3 [Member] |  |  |  |
Deferred compensation plan investments | 0 |  | 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 | 2,200 |  |  |
Interest Rate Derivative Liabilities, at Fair Value | 500 |  |  |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Interest Rate Derivative Assets, at Fair Value | 2,200 |  | 0 |
Interest Rate Derivative Liabilities, at Fair Value | $ 500 |  | $ 0 |
[1] | Approximately $4.2 million and $8.3 million of participant cash was withdrawn from our deferred compensation plan investments during the years ended December 31, 2017 and 2016, respectively. Approximately $23.2 million and $25.4 million of shares within the deferred compensation plan were diversified into other deferred compensation plan investments during the years ended December 31, 2017 and 2016, respectively.

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