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Property: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Property:
Land	$ 1,253,072		$ 1,273,649
Building improvements	5,367,670		5,440,394
Tenant improvements	443,979		442,862
Equipment and furnishings	122,716		123,098
Construction in progress	320,655		209,732
Total	7,508,092		7,489,735
Less accumulated depreciation	(1,417,530)		(1,410,692)
Property, net	6,090,562		6,079,043
Depreciation expenses	58,746	52,052
Gain on the sale of assets	$ 18,587	$ 1,800

X

- Definition

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

+ References

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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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X

- Definition

Gross amount of fixtures and equipment as of the date of the statement of financial position. Fixtures may include and consist of: machinery, equipment, engines, boilers, incinerators, installed building materials; systems and equipment for the purpose of supplying or distributing heating, cooling, electricity, gas, water, air, or light; antennas, cable, wiring and conduits used in connection with radio, television, security, fire prevention, or fire detection or otherwise used to carry electronic signals; telephone systems and equipment; elevators and related machinery and equipment; fire detection, prevention and extinguishing systems and apparatus; security and access control systems and apparatus; plumbing systems; water heaters, ranges, stoves, microwave ovens, refrigerators, dishwashers, garbage disposers, washers, dryers and other appliances; light fixtures, awnings, storm windows and storm doors; pictures, screens, blinds, shades, curtains and curtain rods; mirrors; cabinets, paneling, rugs and floor and wall coverings; fences, trees and plants; swimming pools; and such other items as defined by the reporting entity.

+ References

No definition available.

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X

- Definition

The gains (losses) included in earnings resulting from the sale or disposal of tangible assets. This item does not include any gain (loss) recognized on the sale of oil and gas property or timber property.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 47

-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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X

- Definition

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

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X

- Definition

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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X

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X

- Definition

Amount of depreciation expense for the period.

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-Subparagraph Schedule III

-Article 5



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-Subparagraph (SX 210.5-04.(c) Schedule III)

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X

- Definition

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

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- Definition

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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- Definition

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

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- Definition

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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