REAL ESTATE PROPERTIES (Details) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
REAL ESTATE PROPERTIES [Abstract]
Depreciation Expense During the Period	$ 12,175,000	$ 12,222,000	$ 36,278,000	$ 36,429,000
Estimated useful lives for buildings (in years)			40
Estimated useful lives of improvements and personal property - minimum (in years)			3
Estimated useful lives of improvements and personal property - maximum (in years)			15
Real estate properties component balances [Abstract]
Land	226,398,000		226,398,000		221,523,000
Buildings and building improvements	1,008,527,000		1,008,527,000		985,798,000
Tenant and other improvements	251,982,000		251,982,000		240,134,000
Development	99,261,000		99,261,000		73,722,000
Real estate and development properties	1,586,168,000		1,586,168,000		1,521,177,000
Less accumulated depreciation	(439,465,000)		(439,465,000)		(403,187,000)
Real estate, net	$ 1,146,703,000		$ 1,146,703,000		$ 1,117,990,000

The maximum useful life of buildings assets used in the normal conduct of business and not intended for resale. Examples include buildings.

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The maximum useful life of improvements and personal property long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include improvements, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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The minimum useful life of Improvements and personal property long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include improvements, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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The expense recognized in the current period that allocates the cost of a tangible asset used in providing revenue generating services over the asset's useful life.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-SubTopic 10

-Section 45

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-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.2(d))

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The current amount of expenditures for a real estate project that has not yet been completed.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.10)

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Aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements.

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-Publisher FASB

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-SubTopic 210

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-Subparagraph (SX 210.7-03.1(d))

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Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale.

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-Publisher FASB

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-SubTopic 10

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- Definition

The cumulative amount of depreciation for real estate property held for investment purposes.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 7

-Section 03

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Represents a total which may include the following: (1) land available-for-sale; (2) land available-for-development; (3) investments in building and building improvements; (4) tenant allowances; (5) developments in-process; (6) rental properties; and (7) other real estate investments.

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The net book value of real estate property held for investment purposes.

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Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants.

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-Publisher FASB

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