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Additionally, any default in the payment of any non recourse indebtedness greater than $100,000 of the Company, the Operating Partnership and significant subsidiaries, as defined, regardless of whether the lending institution is a part of the lender groups for the credit facilities, will constitute an event of default under the agreements to the credit facilities.

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Partial recourse features on the mortgage loans.

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Modifications made to the line of credit facilities terms to remove the floor on LIBOR.

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Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date when the debt instrument is scheduled to be fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.).

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The amount of debt premium that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

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The percentage points added to the reference rate to compute the variable rate on the interest rate derivative.

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The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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The date the derivative matures.

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The number of derivative instruments of a particular group held by the entity.

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The strike price on the price risk option contract such as a put option or a call option.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value as of the balance sheet date of interest rate derivative assets, net of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized on the balance sheet.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Amount borrowed under the credit facility as of the balance sheet date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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Amount of long-term debt maturities after year five following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Amount of long-term debt maturing in year four following the date of the latest balance sheet presented in the financial statements, which may include maturities of long-term debt, sinking fund requirements, and other securities redeemable at fixed of determinable prices and dates.

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Total amount of new mortgage loans on real estate during the reporting period.

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Aggregate notional amount of all interest rate derivatives designated as hedging instruments in cash flow hedges. Notional amount refers to the monetary amount specified in the interest rate derivative contract.

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-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

+ Details

Name:	us-gaap_NotionalAmountOfInterestRateCashFlowHedgeDerivatives
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5579245-113959

+ Details

Name:	us-gaap_NotionalAmountOfInterestRateDerivatives
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_SecuredLongtermDebtCurrentAndNoncurrentAbstract
Namespace Prefix:	us-gaap
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Mortgage and Other Indebtedness (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Jun. 30, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Total	$ 5,194,097		$ 5,194,097	$ 5,209,747
Secured Lines of Credit [Abstract]
Weighted average interest rate (in hundredths)	3.35%		3.35%
Fees on amount of unused availability of secured lines of credit, minimum (in hundredths)			0.15%
Fees on amount of unused availability of secured lines of credit, maximum (in hundredths)			0.35%
Percentage floor on LIBOR removed	1.50%
Total Capacity	525,000		525,000
Line of credit, extended maturity date			. NaN, NaN
Additional secured and unsecured lines of credit with commitment	16,021		16,021
Covenants and Restrictions [Abstract]
Minimum loan amount in default payment for recourse loan	50,000		50,000
Minimum loan amount in default payment for non-recourse loan	100,000		100,000
Mortgages on Operating Properties [Abstract]
Mortgage loans closed	2	5
Nonrecourse mortgage loans closed , amount	277,000	268,905
Nonrecourse mortgage loans closed , terms (in years)	ten	ten
Interest rate on mortgage loan (in hundredths)		5.64%
Partial-recourse Mortgage [Abstract]
Partial-recourse in loans		15,475
Expected reduction in partial-recourse		5,650
Interest Rate Hedge Instruments [Abstract]
Interest rate derivatives, notional amount		120,165
Pay fixed/receive, variable interest rate swaps, amortized amount		100,009
Strike rate interest rate cap (in hundredths)	0.0100		0.0100
Schedule of principal repayments [Abstract]
2011	705,701		705,701
2012	870,929		870,929
2013	470,489		470,489
2014	148,920		148,920
2015	791,387		791,387
Thereafter	2,205,705		2,205,705
Total payments	5,193,131		5,193,131
Net unamortized premiums	966		966
Total payments, net of unamortized premiums	5,194,097		5,194,097	5,209,747
Scheduled principal payments	705,701		705,701
Debt maturing in current year with extensions available	580,794		580,794
Loan maturities to be retired or refinanced in current year	124,907		124,907
Non Recourse Loans on Operating Properties [Member] \| Fixed-Rate Debt [Member]
Debt Instrument [Line Items]
Amount	4,036,062		4,036,062	3,664,293
Weighted Average Interest Rate (in hundredths)	5.65%		5.65%	5.85%
Recourse Term Loans on Operating Properties [Member] \| Fixed-Rate Debt [Member]
Debt Instrument [Line Items]
Amount	42,982		42,982	30,449
Weighted Average Interest Rate (in hundredths)	5.50%		5.50%	6.00%
Fixed-Rate Debt [Member]
Debt Instrument [Line Items]
Amount	4,079,044		4,079,044	3,694,742
Weighted Average Interest Rate (in hundredths)	5.65%		5.65%	5.85%
Construction Loans [Member] \| Variable-Rate Debt [Member]
Debt Instrument [Line Items]
Amount	41,774		41,774	14,536
Weighted Average Interest Rate (in hundredths)	3.21%		3.21%	3.32%
Line of Credit [Member] \| Variable-Rate Debt [Member]
Debt Instrument [Line Items]
Amount	182,696		182,696	598,244
Weighted Average Interest Rate (in hundredths)	3.34%		3.34%	3.38%
Unsecured Debt [Member] \| Variable-Rate Debt [Member]
Debt Instrument [Line Items]
Amount	437,214		437,214	437,494
Weighted Average Interest Rate (in hundredths)	1.55%		1.55%	1.66%
Recourse Term Loans on Operating Properties [Member] \| Variable-Rate Debt [Member]
Debt Instrument [Line Items]
Amount	339,494		339,494	350,106
Weighted Average Interest Rate (in hundredths)	2.51%		2.51%	2.28%
Non Recourse Term Loans on Operating Properties [Member] \| Variable-Rate Debt [Member]
Debt Instrument [Line Items]
Amount	113,875		113,875	114,625
Weighted Average Interest Rate (in hundredths)	3.61%		3.61%	3.61%
Variable-Rate Debt [Member]
Debt Instrument [Line Items]
Amount	1,115,053		1,115,053	1,515,005
Weighted Average Interest Rate (in hundredths)	2.41%		2.41%	2.65%
Unsecured lines of credit [Member]
Secured Lines of Credit [Abstract]
Interest rate terms for secured line of credit			LIBOR plus a margin ranging from 0.95% to 1.40%
Weighted average interest rate (in hundredths)	1.29%		1.29%
Outstanding balance	209,214		209,214
Line of credit maturity date			Nov. 30, 2011
Line of credit, extended maturity date			Nov. 30, 2012
Interest Rate Hedge Instruments [Abstract]
Swap Maturity date			Nov. 30, 2011
Secured Line of Credit 1 [Member]
Secured Lines of Credit [Abstract]
Interest rate terms for secured line of credit			LIBOR plus an applicable spread, ranging from 2.00% to 3.00%
Total Capacity	520,000		520,000
Outstanding balance	150,196		150,196
Line of credit maturity date			Aug. 31, 2011
Line of credit, extended maturity date			Apr. 30, 2014
Interest Rate Hedge Instruments [Abstract]
Swap Maturity date			Aug. 31, 2011
Secured Line of Credit 2 [Member]
Secured Lines of Credit [Abstract]
Total Capacity	105,000		105,000
Outstanding balance	1,000		1,000
Line of credit maturity date			Jun. 30, 2013
Interest Rate Hedge Instruments [Abstract]
Swap Maturity date			Jun. 30, 2013
Secured Line of Credit 3 [Member]
Secured Lines of Credit [Abstract]
Interest rate terms for secured line of credit			LIBOR, subject to a floor of 1.50%, plus an applicable margin, ranging from 3.25% to 4.25%
Percentage floor on LIBOR removed after quarter end			1.50%
Total Capacity	525,000		525,000
Outstanding balance	31,500		31,500
Line of credit maturity date			Feb. 28, 2012
Line of credit, extended maturity date			Feb. 28, 2013
Additional amount outstanding for letter of credit	7,291		7,291
Interest Rate Hedge Instruments [Abstract]
Swap Maturity date			Feb. 28, 2012
Interest Rate Swaps [Member]
Interest Rate Hedge Instruments [Abstract]
Number of pay fixed/receive variable interest rate swaps company entered into	4		4
Interest Rate Derivative [Abstract]
Number of Instruments	4		4
Notional amount	119,556		119,556
Derivatives, Fair Value [Line Items]
Notional Amount	119,556		119,556
Interest Rate Caps 1 [Member]
Interest Rate Hedge Instruments [Abstract]
Number of pay fixed/receive variable interest rate swaps company entered into	2		2
Interest Rate Derivative [Abstract]
Number of Instruments	2		2
Notional amount	133,680		133,680
Derivatives, Fair Value [Line Items]
Notional Amount	133,680		133,680
Interest Rate Swaption [Member]
Interest Rate Derivative [Abstract]
Notional amount	57,805		57,805
Derivatives, Fair Value [Line Items]
Notional Amount	57,805		57,805
Amortized amount	48,337		48,337
Designated Benchmark Interest Rate			1-month LIBOR
Strike Rate	2.149%		2.149%
Fair Value, Interest rate derivatives	(968)		(968)	0
Maturity Date			Apr. 30, 2016
Interest Rate Cap 1 [Member]
Interest Rate Derivative [Abstract]
Notional amount	63,555		63,555
Derivatives, Fair Value [Line Items]
Notional Amount	63,555		63,555
Designated Benchmark Interest Rate			USD - SIFMA municipal swap index
Strike Rate	1.00%		1.00%
Fair Value, Interest rate derivatives	3		3
Maturity Date			Mar. 31, 2012
Interest Rate Cap 2 [Member]
Interest Rate Derivative [Abstract]
Notional amount	70,125		70,125
Derivatives, Fair Value [Line Items]
Notional Amount	70,125		70,125
Amortized amount	69,375		69,375
Designated Benchmark Interest Rate			3-month LIBOR
Strike Rate	3.00%		3.00%
Fair Value, Interest rate derivatives	0		0	3
Maturity Date			Jan. 31, 2012
Pay fixed/receive variable swap 2 [Member]
Interest Rate Derivative [Abstract]
Notional amount	36,181		36,181
Derivatives, Fair Value [Line Items]
Notional Amount	36,181		36,181
Amortized amount	30,276		30,276
Designated Benchmark Interest Rate			1-month LIBOR
Strike Rate	2.187%		2.187%
Fair Value, Interest rate derivatives	(663)		(663)	0
Maturity Date			Apr. 30, 2016
Pay fixed/receive variable swap 3 [Member]
Interest Rate Derivative [Abstract]
Notional amount	13,531		13,531
Derivatives, Fair Value [Line Items]
Notional Amount	13,531		13,531
Amortized amount	11,313		11,313
Designated Benchmark Interest Rate			1-month LIBOR
Strike Rate	2.142%		2.142%
Fair Value, Interest rate derivatives	(223)		(223)	0
Maturity Date			Apr. 30, 2016
Pay fixed/receive variable swap 4 [Member]
Interest Rate Derivative [Abstract]
Notional amount	12,039		12,039
Derivatives, Fair Value [Line Items]
Notional Amount	12,039		12,039
Amortized amount	10,083		10,083
Designated Benchmark Interest Rate			1-month LIBOR
Strike Rate	2.236%		2.236%
Fair Value, Interest rate derivatives	$ (245)		$ (245)	$ 0
Maturity Date			Apr. 30, 2016