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
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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The current amount of expenditures for a real estate project that has not yet been completed.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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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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- Definition

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
-SubTopic 10
-Section 45
-Paragraph 4
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
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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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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 ($)	3 Months Ended		9 Months Ended
REAL ESTATE PROPERTIES (Details) - USD ($)	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Real Estate Properties [Line Items]
Depreciation Expense During the Period	$ 15,855,000	$ 14,945,000	$ 47,273,000	$ 44,503,000
Real Estate Properties
Land	306,518,000		306,518,000		$ 301,435,000
Building and building improvements	1,420,227,000		1,420,227,000		1,393,688,000
Tenant and other improvements	362,935,000		362,935,000		353,884,000
Development	206,820,000		206,820,000		170,441,000
Real estate and development properties	2,296,500,000		2,296,500,000		2,219,448,000
Less accumulated depreciation	(679,948,000)		(679,948,000)		(657,454,000)
Real estate, net	$ 1,616,552,000		$ 1,616,552,000		$ 1,561,994,000
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