Notes Payable (Summary Of Indebtedness) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Unsecured Debt	$ 1,837,911,000us-gaap_UnsecuredDebt	$ 1,588,798,000us-gaap_UnsecuredDebt
Secured notes payable	905,628,000us-gaap_SecuredDebt	941,968,000us-gaap_SecuredDebt
Total notes payable	2,743,500,000us-gaap_NotesPayable	2,530,800,000us-gaap_NotesPayable
Notes payable, effective interest rate	3.59%
Value Of Real Estate Assets At Cost Subject To Secured Notes	1,541,300,000	1,582,500,000
5.08% Notes Due 2015 [Member] \| Senior Unsecured Notes [Member]
Unsecured Debt	249,900,000	249,700,000
Notes payable, effective interest rate	5.08%
Notes payable, maturity date	2015
5.75% Notes Due 2017 [Member] \| Senior Unsecured Notes [Member]
Unsecured Debt	246,500,000	246,400,000
Notes payable, effective interest rate	5.75%
Notes payable, maturity date	2017
4.70% Notes Due 2021 [Member] \| Senior Unsecured Notes [Member]
Unsecured Debt	249,000,000	248,800,000
Notes payable, effective interest rate	4.70%
Notes payable, maturity date	2021
3.07% Notes Due 2022 [Member] \| Senior Unsecured Notes [Member]
Unsecured Debt	347,000,000	346,700,000
Notes payable, effective interest rate	3.07%
Notes payable, maturity date	2022
5.00% Notes Due 2023 [Member] \| Senior Unsecured Notes [Member]
Unsecured Debt	247,800,000	247,700,000
Notes payable, effective interest rate	5.00%
Notes payable, maturity date	2023
4.27% Notes Due 2024 [Member] \| Senior Unsecured Notes [Member]
Unsecured Debt	249,600,000	249,500,000
Notes payable, effective interest rate	4.27%
Notes payable, maturity date	2024
3.59% Notes Due 2024 [Member] \| Senior Unsecured Notes [Member]
Unsecured Debt	248,100,000	0
Notes payable, effective interest rate	3.59%
Notes payable, maturity date	2024
Secured Notes 0.91% to 5.63% Conventional Mortgage Notes Due 2018 to 2045 [Member] \| Secured Debt [Member]
Secured notes payable	870,900,000	905,700,000
Other Floating Rate Debt Included In Secured Notes (0.91%) [Member] \| Secured Debt [Member]
Secured notes payable	175,000,000	175,000,000
Secured Notes 1.14% Floating Rate Tax Exempt Mortgage Note Due 2028 [Member] \| Secured Debt [Member]
Secured notes payable	$ 34,700,000	$ 36,300,000
Notes payable, effective interest rate	1.30%
Notes payable, maturity date	2028
Minimum [Member] \| Secured Notes 0.91% to 5.63% Conventional Mortgage Notes Due 2018 to 2045 [Member] \| Secured Debt [Member]
Notes payable, effective interest rate	0.91%
Notes payable, maturity date	2018
Minimum [Member] \| Other Floating Rate Debt Included In Secured Notes (0.91%) [Member] \| Secured Debt [Member]
Notes payable, effective interest rate	0.91%
Maximum [Member] \| Secured Notes 0.91% to 5.63% Conventional Mortgage Notes Due 2018 to 2045 [Member] \| Secured Debt [Member]
Notes payable, effective interest rate	5.63%
Notes payable, maturity date	2045

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Value of real estate assets, at cost, as of the balance sheet date that are subject to secured notes payable.

+ References

No definition available.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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