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Notes Payable (Summary Of Indebtedness) (Details) (USD $)						6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended						6 Months Ended		6 Months Ended
	Jun. 30, 2014	Apr. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Senior Unsecured Notes [Member]	Dec. 31, 2013 Senior Unsecured Notes [Member]	Jun. 30, 2014 Tax Exempt Mortgage Note Due 2028 (1.26% floating rate) Secured Debt [Member]	Dec. 31, 2013 Tax Exempt Mortgage Note Due 2028 (1.26% floating rate) Secured Debt [Member]	Jun. 30, 2014 5.08% Notes Due 2015 [Member] Senior Unsecured Notes [Member]	Dec. 31, 2013 5.08% Notes Due 2015 [Member] Senior Unsecured Notes [Member]	Jun. 30, 2014 5.75% Notes Due 2017 [Member] Senior Unsecured Notes [Member]	Dec. 31, 2013 5.75% Notes Due 2017 [Member] Senior Unsecured Notes [Member]	Jun. 30, 2014 4.70% Notes Due 2021 [Member] Senior Unsecured Notes [Member]	Dec. 31, 2013 4.70% Notes Due 2021 [Member] Senior Unsecured Notes [Member]	Jun. 30, 2014 3.07% Notes Due 2022 [Member] Senior Unsecured Notes [Member]	Dec. 31, 2013 3.07% Notes Due 2022 [Member] Senior Unsecured Notes [Member]	Jun. 30, 2014 5.00% Notes Due 2023 [Member] Senior Unsecured Notes [Member]	Dec. 31, 2013 5.00% Notes Due 2023 [Member] Senior Unsecured Notes [Member]	Jun. 30, 2014 4.27% Notes Due 2024 [Member] Senior Unsecured Notes [Member]	Dec. 31, 2013 4.27% Notes Due 2024 [Member] Senior Unsecured Notes [Member]	Jun. 30, 2014 Secured Notes 0.95% to 5.63% Conventional Mortgage Notes Due 2014 to 2045 [Member] Secured Debt [Member]	Dec. 31, 2013 Secured Notes 0.95% to 5.63% Conventional Mortgage Notes Due 2014 to 2045 [Member] Secured Debt [Member]	Jun. 30, 2014 Secured Notes 0.95% Floating Rate [Member] Secured Debt [Member]	Dec. 31, 2013 Secured Notes 0.95% Floating Rate [Member] Secured Debt [Member]	Jun. 30, 2014 Minimum [Member] Secured Notes 0.95% to 5.63% Conventional Mortgage Notes Due 2014 to 2045 [Member] Secured Debt [Member]	Jun. 30, 2014 Minimum [Member] Secured Notes 0.95% Floating Rate [Member] Secured Debt [Member]	Jun. 30, 2014 Maximum [Member] Secured Notes 0.95% to 5.63% Conventional Mortgage Notes Due 2014 to 2045 [Member] Secured Debt [Member]	Jun. 30, 2014 Line of Credit [Member] Commercial Banks [Member]	Dec. 31, 2013 Line of Credit [Member] Commercial Banks [Member]
Unsecured notes payable	$ 1,769,287,000		$ 1,588,798,000	$ 1,589,300,000	$ 1,588,800,000			$ 249,800,000	$ 249,700,000	$ 246,400,000	$ 246,400,000	$ 248,900,000	$ 248,800,000	$ 346,800,000	$ 346,700,000	$ 247,800,000	$ 247,700,000	$ 249,600,000	$ 249,500,000								$ 180,000,000	$ 0
Total secured notes payable	930,952,000		941,968,000			35,500,000	36,300,000													895,400,000	905,700,000	175,000,000	175,000,000
Total notes payable	$ 2,700,200,000		$ 2,530,800,000
Notes payable, effective interest rate		6.00%				1.26%		5.08%		5.75%		4.70%		3.07%		5.00%		4.27%						0.95%	0.95%	5.63%
Notes payable, maturity date						2028		2015		2017		2021		2022		2023		2024						2014		2045

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Debt Maturity Date

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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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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