Fair Value Measurements (Financial Assets And Liabilities Measured At Fair Value) (Details) $ in Thousands		12 Months Ended
	Jun. 01, 2017	Dec. 31, 2019 USD ($)		Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Current Fiscal Year End Date		--12-31
Deferred compensation plan investments		$ 151,800	[1]	$ 144,700
Participant Withdrawals From Deferred Compensation Plan Investments		18,000		12,700
Diversification of share awards within deferred compensation plan (Equity)		52,674		40,294	$ 23,233
Interest Rate Derivative Liabilities, at Fair Value		$ 0		$ 7,400
Number of Operating properties Acquired		4		3
Level 1 [Member]
Deferred compensation plan investments		$ 151,800		$ 144,700
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 Liabilities, at Fair Value		0		0
Interest Rate Swap [Member]
Interest Rate Derivative Assets, at Fair Value		0		0
Interest Rate Derivative Liabilities, at Fair Value		0		7,400
Interest Rate Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Interest Rate Derivative Liabilities, at Fair Value		$ 0		$ 7,400
Camden Buckhead Square [Member]
Number of Operating properties Acquired	1

[1] Approximately $18.0 million and $12.7 million of participant cash was withdrawn from our deferred compensation plan investments during the years ended December 31, 2019 and 2018, respectively. Approximately $40.3 million of shares within the deferred compensation plan were diversified into other deferred compensation plan investments during the year ended 2018.