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Organization and Background (Details)	Mar. 31, 2015 state
Organization and Background
Number of real estate properties	116us-gaap_NumberOfRealEstateProperties
Number of states in which properties are located	30us-gaap_NumberOfStatesInWhichEntityOperates
Properties owned by consolidated joint ventures
Organization and Background
Number of real estate properties	7us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = us-gaap_ConsolidatedPropertiesMember
Properties owned by unconsolidated joint ventures
Organization and Background
Number of real estate properties	4us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = us-gaap_UnconsolidatedPropertiesMember

X

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_NumberOfRealEstateProperties
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

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=us-gaap_ConsolidatedPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=us-gaap_UnconsolidatedPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: