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Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Deferred compensation plan investments | $ 144,700 | [1] | $ 120,300 |
Participant Withdrawals From Deferred Compensation Plan Investments | 12,700 |  | 4,200 |
Diversification of share awards within deferred compensation plan (Equity) | 40,294 |  | 23,233 | $ 25,428
Interest Rate Derivative Assets, at Fair Value | 0 |  | 2,200 |
Interest Rate Derivative Liabilities, at Fair Value | $ 7,400 |  | 500 |
Number of Operating properties Acquired | 3 |  |  |
Level 1 [Member] |  |  |  |
Deferred compensation plan investments | $ 144,700 |  | 120,300 |
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 | 0 |  | 2,200 |
Interest Rate Derivative Liabilities, at Fair Value | 7,400 |  | 500 |
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Interest Rate Derivative Assets, at Fair Value | 0 |  | 2,200 |
Interest Rate Derivative Liabilities, at Fair Value | $ 7,400 |  | $ 500 |
Camden Buckhead Square [Member] |  |  |  |
Number of Operating properties Acquired |  |  | 1 |
[1] | Approximately $12.7 million and $4.2 million of participant cash was withdrawn from our deferred compensation plan investments during the years ended December 31, 2018 and 2017, respectively. Approximately $40.3 million and $23.2 million of shares within the deferred compensation plan were diversified into other deferred compensation plan investments during the years ended December 31, 2018 and 2017, respectively.

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