Subsequent Events (Details) (Chartwell Partnership [Member], USD $)	12 Months Ended
Dec. 31, 2011	Feb. 15, 2012 properties
Chartwell Partnership [Member]
Subsequent Events (Textuals) [Abstract]
Percentage of partnership owned		50.00%
Company investment in transaction	$ 503,000,000
Number Of Properties With Controlling Interest Of Company		39
Number of properties in portfolio		42
Percentage Of Assets Owned by Minority		50.00%
Total investment price	925,000,000

Number of properties in portfolio.

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- Definition

Number of properties with controlling interest of the company.

+ References

No definition available.

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- Definition

Percentage of Assets Owned by Minority.

+ References

No definition available.

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- Details

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- Definition

Amount of cash paid to acquire the entity.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

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- Definition

Description of the components of the costs of a business acquisition and the basis for determining value assigned to the components (including carryover basis ascribed to securities issued in a leveraged buy-out transaction). For example, cash paid to shareholders of acquired entity, fair value of debt and equity securities issued to shareholders of acquired entity, and transaction costs paid to third parties.

+ References

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

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 88-16

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

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- Definition

Percent of net assets at close of period. For schedules of investments that are categorized, each category should have a percent of net assets for the aggregated value of the Investments in the category.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph 2

-Article 12

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12C

-Paragraph Column D

-Article 12

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 12

-Paragraph 3

-Article 12

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