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ORGANIZATION AND BACKGROUND (Details)	Dec. 31, 2012 item property
Organization and Background
Number of real estate properties	100
Number of states in which properties are located	29
Wholly owned properties
Organization and Background
Number of real estate properties	93
Properties owned by consolidated joint ventures
Organization and Background
Number of real estate properties	4
Properties owned by unconsolidated joint ventures
Organization and Background
Number of real estate properties	7

X

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of states the entity operates in as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RealEstatePropertiesLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration