Property: (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended		0 Months Ended
Sep. 30, 2013 property	Sep. 30, 2012	Sep. 30, 2013 property	Sep. 30, 2012	Dec. 31, 2012	Sep. 17, 2013 Camelback Colonnade
Acquisition
Land	$ 1,751,611		$ 1,751,611		$ 1,572,621
Buildings and improvements	6,642,696		6,642,696		6,417,674
Tenant improvements	554,528		554,528		496,203
Equipment and furnishings	153,146		153,146		149,959
Construction in progress	239,106		239,106		376,249
Total	9,341,087		9,341,087		9,012,706
Less accumulated depreciation	(1,607,158)		(1,607,158)		(1,533,160)
Property, net	7,733,929		7,733,929		7,479,546
Depreciation expenses	71,136	55,086	207,877	164,369
Write off of development cost	(126)	(2,623)	(1,497)	(8,549)
Gain on remeasurement						36,341
Gain (loss) on the sale of assets			5,401
Impairment loss						$ (34,452)
Number of Real Estate Properties	2		2

Represents the development cost written off during the period.

No definition available.

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- Details

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- Definition

In a business combination achieved in stages, this element represents the amount of net gain (loss) recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 805

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)(2)

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- Definition

The expense recognized in the current period that allocates the cost of nonproduction tangible assets over their useful lives.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

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- Definition

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

+ References

+ Details

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Period Type:	instant

- Definition

Amount before accumulated depreciation of fixtures and equipment. Includes, but is not limited to, machinery, equipment, and engines.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760

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Period Type:	duration

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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-Publisher FASB

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-Glossary Impairment

-URI http://asc.fasb.org/extlink&oid=6515133

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Balance Type:	debit
Period Type:	duration

- Definition

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

+ References

+ Details

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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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

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-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.13)

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+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

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-Subparagraph (SX 210.7-03.1(3))

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 7

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- Definition

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.

+ References

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- Definition

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.

+ References

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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.

+ References

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