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Notes Payable (Summary Of Indebtedness) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Unsecured Debt	$ 1,338,628	$ 1,583,236
Secured notes payable	865,970	897,352
Total notes payable	2,204,600	2,480,600
Value Of Real Estate Assets At Cost Subject To Secured Notes	1,534,900	1,598,900
Senior Unsecured Notes [Member]
Unsecured Debt	1,338,600	1,583,200
Five Point Eight three Percentage Notes Due2017 [Member] | Senior Unsecured Notes [Member]
Unsecured Debt	$ 0	246,600
Notes payable, effective interest rate	5.83%
Debt Instrument, Maturity Date	May 15, 2017
4.78% Notes Due 2021 | Senior Unsecured Notes [Member]
Unsecured Debt	$ 248,700	248,400
Notes payable, effective interest rate	4.78%
Debt Instrument, Maturity Date	Jun. 15, 2021
3.15% Notes Due 2022 | Senior Unsecured Notes [Member]
Unsecured Debt	$ 346,600	346,000
Notes payable, effective interest rate	3.15%
Debt Instrument, Maturity Date	Dec. 15, 2022
5.07% Notes Due 2023 | Senior Unsecured Notes [Member]
Unsecured Debt	$ 247,600	247,200
Notes payable, effective interest rate	5.07%
Debt Instrument, Maturity Date	Jun. 15, 2023
4.36% Notes Due 2024 | Senior Unsecured Notes [Member]
Unsecured Debt	$ 248,500	248,200
Notes payable, effective interest rate	4.36%
Debt Instrument, Maturity Date	Jan. 15, 2024
3.68% Notes Due 2024 | Senior Unsecured Notes [Member]
Unsecured Debt	$ 247,200	246,800
Notes payable, effective interest rate	3.68%
Debt Instrument, Maturity Date	Sep. 15, 2024
Secured Notes 1.92% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member] | Secured Debt [Member]
Secured notes payable	$ 866,000	866,700
Secured Notes 2.18% Floating Rate Tax Exempt Mortgage Note Due 2028 | Secured Debt [Member]
Secured notes payable	0	30,700
Secured Notes 1.92% Floating Rate [Member] | Secured Debt [Member]
Secured notes payable	$ 175,000	$ 175,000
Minimum [Member] | Secured Notes 1.92% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member] | Secured Debt [Member]
Notes payable, effective interest rate	1.92%
Debt Instrument, Maturity Date	Oct. 01, 2018
Minimum [Member] | Secured Notes 1.92% Floating Rate [Member] | Secured Debt [Member]
Notes payable, effective interest rate	1.92%
Maximum [Member] | Secured Notes 1.92% to 5.77% Conventional Mortgage Notes Due 2018 to 2045 [Member] [Member] | Secured Debt [Member]
Notes payable, effective interest rate	5.77%
Debt Instrument, Maturity Date	Sep. 01, 2045
Short-term Debt [Member]
Debt Instrument, Maturity Date	May 14, 2018

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-Name Accounting Standards Codification
-Topic 210
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