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Notes Payable (Summary of Indebtedness) (Details) (USD $)				6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended		6 Months Ended					6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Jun. 30, 2011 Minimum [Member] 1.12% - 6.00% Conventional Mortgage Notes, Due 2011 Till 2045 Member	Jun. 30, 2011 Minimum [Member] 1.12%-1.70$ Floating Rate Debt [Member]	Jun. 30, 2011 Maximum [Member] 1.12% - 6.00% Conventional Mortgage Notes, Due 2011 Till 2045 Member	Jun. 30, 2011 Maximum [Member] 1.12%-1.70$ Floating Rate Debt [Member]	Jun. 30, 2011 Commercial Banks [Member] Term Loan, Due 2012 [Member]	Dec. 31, 2010 Commercial Banks [Member] Term Loan, Due 2012 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member]	Dec. 31, 2010 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 5.93% Notes Due 2012 [Member]	Dec. 31, 2010 Senior Unsecured Notes [Member] 5.93% Notes Due 2012 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 5.45% Notes Due 2013 [Member]	Dec. 31, 2010 Senior Unsecured Notes [Member] 5.45% Notes Due 2013 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 5.08% Notes Due 2015 [Member]	Dec. 31, 2010 Senior Unsecured Notes [Member] 5.08% Notes Due 2015 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 5.75% Notes Due 2017 [Member]	Dec. 31, 2010 Senior Unsecured Notes [Member] 5.75% Notes Due 2017 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 4.70% Notes Due 2021 [Member]	Jun. 30, 2011 4.70% Notes Due 2021 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 5.00% Notes Due 2023 [Member]	Jun. 30, 2011 Medium-Term Notes [Member] 4.99% Notes Due 2011 [Member]	Dec. 31, 2010 Medium-Term Notes [Member] 4.99% Notes Due 2011 [Member]	Jun. 30, 2011 1.12% - 6.00% Conventional Mortgage Notes, Due 2011 Till 2045 Member	Dec. 31, 2010 1.12% - 6.00% Conventional Mortgage Notes, Due 2011 Till 2045 Member	Jun. 30, 2011 1.74% Tax Exempt Mortgage Note Due 2028 Member	Dec. 31, 2010 1.74% Tax Exempt Mortgage Note Due 2028 Member	Jun. 30, 2011 1.74 % Floating Rate Tax Exempt Debt [Member]	Dec. 31, 2010 1.74 % Floating Rate Tax Exempt Debt [Member]	Jun. 30, 2011 1.12%-1.70$ Floating Rate Debt [Member]	Dec. 31, 2010 1.12%-1.70$ Floating Rate Debt [Member]	Dec. 31, 2010 Commercial Banks [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member]	Dec. 31, 2010 Senior Unsecured Notes [Member]	Jun. 30, 2011 Medium-Term Notes [Member]	Dec. 31, 2010 Medium-Term Notes [Member]
Total unsecured notes payable	$ 1,380,368,000		$ 1,507,757,000						$ 500,000,000		$ 88,000,000	$ 189,500,000	$ 189,500,000	$ 199,700,000	$ 199,600,000	$ 249,300,000	$ 249,200,000	$ 246,200,000	$ 246,100,000	$ 248,500,000		$ 247,200,000		$ 35,400,000									$ 500,000,000	$ 1,380,400,000	$ 972,400,000	$ 1,380,400,000	$ 1,507,800,000
Total secured notes payable	1,053,699,000		1,055,997,000																						1,014,000,000	1,015,700,000	39,700,000	40,300,000	39,700,000	40,300,000	189,900,000	189,900,000
Total notes payable	$ 2,434,100,000		$ 2,563,800,000
Notes payable, interest percentage	4.99%	7.69%		0.99%	0.99%	6.00%	1.64%			7.69%		5.93%		5.45%		5.08%		5.75%			4.70%		4.99%				1.53%		1.53%
Notes payable, maturity date				2012		2045		2012		2011		2012		2013		2015		2017		2021		2023	2011				2028

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Interest rate stated in the contractual debt agreement.

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