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Net Change in Operating Accounts (Effect of Changes in the Operating Accounts on Cash Flows from Operating Activities) (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Net Change in Operating Accounts
Other assets, net	$ 5,047	$ (734)
Accounts payable and accrued expenses	(9,530)	(9,270)
Accrued real estate taxes	5,086	5,175
Other liabilities	(4,591)	699
Other	209	64
Net change in operating accounts and other	$ (3,779)	$ (4,066)

X

- Definition

The net change during the reporting period in the aggregate amount of obligations and expenses incurred but not paid.

+ References

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

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- Definition

The net change during the reporting period of all current assets and liabilities used in operating activities.

+ References

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

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- Definition

The net change during the reporting period in other operating assets not otherwise defined in the taxonomy.

+ References

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

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- Definition

For entities with classified balance sheets, the net change during the reporting period in the value of other assets or liabilities used in operating activities, that are not otherwise defined in the taxonomy. For entities with unclassified balance sheets, the net change during the reporting period in the value of all other assets or liabilities used in operating activities.

+ References

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

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- Definition

The net change during the reporting period in other operating obligations not otherwise defined in the taxonomy.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28

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- Definition

The net change during the period in the amount of cash payments due to taxing authorities for non-income-related taxes.

+ References

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-Name Statement of Financial Accounting Standard (FAS)
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