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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

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-Section 45

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

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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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 FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(3))

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-Publisher SEC

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Amount of real estate investment property 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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Amount of real estate investment property, net of accumulated depreciation, 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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REAL ESTATE PROPERTIES (Details) - USD ($)	3 Months Ended		6 Months Ended
REAL ESTATE PROPERTIES (Details) - USD ($)	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Real Estate Properties [Line Items]
Depreciation Expense During the Period	$ 14,720,000	$ 14,094,000	$ 29,558,000	$ 28,067,000
Real Estate Properties
Land	286,708,000		286,708,000		$ 283,116,000
Building and building improvements	1,311,445,000		1,311,445,000		1,284,961,000
Tenant and other improvements	334,808,000		334,808,000		326,896,000
Development	198,143,000		198,143,000		179,973,000
Real estate and development properties	2,131,104,000		2,131,104,000		2,074,946,000
Less accumulated depreciation	(627,336,000)		(627,336,000)		(600,526,000)
Real estate, net	$ 1,503,768,000		$ 1,503,768,000		$ 1,474,420,000
Building [Member]
Real Estate Properties [Line Items]
Property, Plant and Equipment, Useful Life			40 years
Minimum [Member] \| Improvements [Member]
Real Estate Properties [Line Items]
Property, Plant and Equipment, Useful Life			3 years
Maximum [Member] \| Improvements [Member]
Real Estate Properties [Line Items]
Property, Plant and Equipment, Useful Life			15 years