Represents accelerated principal payments made during the period.

No definition available.

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- Definition

Represents the aggregate carrying amount of loans in which accelerated principal payments are being made.

+ References

No definition available.

+ Details

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- Definition

Represents the number of loans in which accelerated principal payments are being made.

+ References

No definition available.

+ Details

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- Definition

Represents the carrying amount of debt instruments matured but not repaid or refinanced by the entity.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Represents the amount of variable rate debt swapped to fixed rate debt.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the weighted average maturity period for debt instrument.

+ References

No definition available.

+ Details

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- Definition

Represents the weighted average maturity period for the debt instrument.

+ References

No definition available.

+ Details

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing after the fourth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument maturing after the fourth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument maturing in the next fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument maturing in the fourth fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument maturing in the third fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument maturing in the second fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of long-term debt outstanding by type or by instrument maturing in the remainder of the fiscal year following the latest fiscal year ended.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). 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.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16, 20

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 1A

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number APB14-1

-Paragraph 31

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 55

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

+ Details

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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 470

-SubTopic 10

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 10

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year.

+ References

+ Details

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year.

+ References

+ Details

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year.

+ References

+ Details

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- Definition

Amount of long-term debt, sinking fund requirements, and other securities redeemable at fixed or determinable prices and dates maturing in the remainder of the fiscal year following the latest fiscal year ended.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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Mortgages and Notes Payable (Details 2) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Jul. 31, 2012	Dec. 31, 2011
Debt Maturities
2012	$ 62,230
2013	276,324
2014	206,723
2015	706,439
2016	348,214
Thereafter	1,333,588
Total	2,933,518
Weighted average interest rate on debt (as a percent)
2012	7.60%
2013	5.21%
2014	6.84%
2015	4.68%
2016	3.23%
Thereafter	6.87%
Total	5.77%
Variable rate debt swapped to fixed rate debt	76,109	300,000	76,269
Derivative reference rate	one-month floating rate LIBOR
Fixed interest rate (as a percent)	0.53875%	0.53875%
Weighted average maturity period	5 years 6 months
Fixed rate debt
Debt Maturities
2012	62,230
2013	276,324
2014	195,777
2015	471,439
2016	348,214
Thereafter	1,333,588
Total	2,687,572
Weighted average interest rate on debt (as a percent)
2012	7.60%
2013	5.21%
2014	7.09%
2015	5.76%
2016	3.23%
Thereafter	6.87%
Total	6.06%
Variable rate debt
Debt Maturities
2012	0
2013	0
2014	10,946
2015	235,000
2016	0
Thereafter	0
Total	245,946
Weighted average interest rate on debt (as a percent)
2012	0.00%
2013	0.00%
2014	2.50%
2015	2.50%
2016	0.00%
Thereafter	0.00%
Total	2.50%
Mortgages payable
Weighted average interest rate on debt (as a percent)
Total	6.11%		6.13%
Number of loans in which accelerated principal payments are being made	2
Outstanding balance of loans in which accelerated principal payments are being made	71,365
Accelerated payments made	5,937
Weighted average years to maturity	6 years 6 months 18 days
Loan that has matured	26,865
Mortgages payable \| Fixed rate debt
Debt Maturities
2012	62,230
2013	276,324
2014	195,777
2015	471,439
2016	48,214
Thereafter	1,208,588
Total	2,262,572		2,691,323
Weighted average interest rate on debt (as a percent)
Discount, net of accumulated amortization	(1,619)		(2,003)
Mortgages payable \| Variable rate debt
Debt Maturities
2012	0
2013	0
2014	10,946
2015	0
2016	0
Thereafter	0
Total	10,946
Notes payable
Weighted average interest rate on debt (as a percent)
Total	12.80%		12.62%
Notes payable \| Fixed rate debt
Debt Maturities
2012	0
2013	0
2014	0
2015	0
2016	0
Thereafter	125,000
Total	125,000		138,900
Unsecured credit facility \| Fixed rate debt
Debt Maturities
2012	0
2013	0
2014	0
2015	0
2016	300,000
Thereafter	0
Total	300,000
Unsecured credit facility \| Variable rate debt
Debt Maturities
2012	0
2013	0
2014	0
2015	235,000
2016	0
Thereafter	0
Total	$ 235,000