Face amount of debt issued from our existing shelf registration statement with the aggregate principal amount for the unsecured notes.

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Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument Due Date

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Data Type:	us-types:dateStringItemType
Balance Type:	na
Period Type:	duration

- Definition

Discounted Notes Payable Face Amount

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Balance Type:	na
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- Definition

Extended maturity period of secured third-party note payable made to one of our fully-consolidated joint ventures.

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Data Type:	xbrli:stringItemType
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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted which is fully-consolidated in the financial statements.

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Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Option to extend the period of unsecured credit facility.

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- Definition

Original maturity period of secured third-party note payable made to one of our fully-consolidated joint ventures.

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

Secured third party note payable to one of our fully-consolidated joint ventures, in which we hold a 25% ownership, which was originally scheduled to mature in August 2011 and was contractually extended to August 2012.

+ Details

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

- Definition

Terms of bid rate loans.

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- Definition

Value not exceeding the lesser of the amount noted and the amount available under the line of credit.

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- Definition

Weighted average interest rate on floating rate debt.

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Data Type:	us-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted Average Maturity Of Indebtedness Including Unsecured Line Of Credit

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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Interest rate stated in the contractual debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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Balance Type:	credit
Period Type:	instant

- Definition

Reflects when the credit facility terminates, which may be presented in a variety of ways (year, month and year, day, month and year, quarter).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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- Definition

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.

+ References

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 19, 22
-Article 5

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

- Definition

The amount of loss reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-Subparagraph b(4)

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 19
-Subparagraph b

+ Details

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Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow from the payment of uncollateralized debt obligation (where debt is not backed by the pledge of collateral).

+ References

+ Details

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

- Definition

Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28

+ Details

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Notes Payable (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended		1 Months Ended		6 Months Ended
Notes Payable (Narrative) (Details) (USD $)	Jun. 11, 2011	Jun. 30, 2011 years	Jun. 30, 2011 years	Jun. 30, 2011 years	Jun. 30, 2010	Mar. 31, 2011	Mar. 31, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member]	Jun. 30, 2011 Senior Unsecured Notes [Member] 7.69% Notes Due 2011 [Member]	Jun. 30, 2011 Medium-Term Notes [Member] 4.99% Notes Due 2011 [Member]	Jun. 30, 2011 4.625% Notes Due 2010 [Member]	Jun. 30, 2011 4.875 Notes Due 2010 [Member]	Jun. 30, 2011 Line of Credit [Member]	Jun. 30, 2011 Letter of Credit [Member]
Amount of current borrowing capacity under unsecured credit facility												$ 500,000,000
Maturity period of unsecured credit facility				August 2012
Optional extension period of unsecured credit facility				August 2013
Terms of bid rate loans				180
Value not exceeding the amount available under the line of credit												250
Maximum borrowing capacity under unsecured credit facility												600,000,000	100,000,000
Outstanding letters of credit under credit facility												9,900,000
Available amount under unsecured credit facility												490,100,000
Repayment of senior unsecured notes		500,000,000	500,000,000	500,000,000			88,000,000		35,000,000
Secured third party note payable to one of our fully-consolidated joint ventures		31,500,000	31,500,000	31,500,000
Investment ownership percentage in fully-consolidated joint venture				25.00%
Original maturity period of secured third-party note payable			August 2011
Extended maturity period of secured third-party note payable			August 2012
Interest rate of notes payable		4.99%	4.99%	4.99%		7.69%		7.69%	4.99%	4.625%	4.875%
Aggregate principal face amount of senior unsecured notes										250,000,000
Proceeds from notes payable	491,800,000			495,705,000	4,220,000
Notes payable, maturity date								2011	2011	June 2021	June 2023
Discounted Notes Payable Face Amount				The 2021 Notes were offered to the public at 99.404% of their face amount with a yield to maturity of 4.70% and the 2023 Notes were offered to the public at 98.878% of their face amount with a yield to maturity of 5.00%.
Write off of unamortized loan costs			500,000
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring				29,800,000
Non cash charges related to dedesignation of interest rate swap				$ 29,800,000
Weighted average interest rate on floating rate debt		1.10%	1.10%	1.10%	1.30%
Weighted average maturity of indebtedness (including unsecured line of credit)		7.3	7.3	7.3