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UNSECURED SENIOR NOTES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2012 Maximum	Jun. 30, 2012 Senior notes 4.80% due July 15, 2022	Dec. 31, 2012 Senior notes 4.80% due July 15, 2022 Maximum	Dec. 31, 2012 Senior notes 4.80% due July 15, 2022 Minimum
Senior Notes
Senior notes, principal amount		$ 250
Senior notes, interest rate (as a percent)		4.80%
Consolidated leverage ratio			0.60
Consolidated interest coverage ratio				1.50
Secured debt leverage ratio	0.40
Financial and customary covenant, minimum unencumbered asset (as a percent)				150.00%

X

- Definition

The interest coverage ratio permitted under the terms of a senior credit facility covenant.

+ References

No definition available.

+ Details

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X

- Definition

The leverage ratio permitted under the terms of a senior credit facility covenant.

+ References

No definition available.

+ Details

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X

- Definition

The secured leverage ratio permitted under the terms of a senior credit facility covenant.

+ References

No definition available.

+ Details

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X

- Definition

The covenant percentage permitted under the terms of a senior credit facility of unencumbered assets to unsecured indebtedness.

+ References

No definition available.

+ Details

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X

- Definition

Increase of additional borrowings on existing and new debt instruments.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

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X

- 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



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22(a)(1))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Details

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