Dispositions Disclosures [Line Items]

No definition available.

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- Definition

Number of Real Estate Properties Sold

+ References

No definition available.

+ Details

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- Definition

Square Footage Of Real Estate Properties Acquired Or Disposed.

+ References

No definition available.

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- Definition

Area of land held.

+ References

No definition available.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

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- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

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- Definition

The net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.14(d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

Mortgage loan related to property sales in noncash investing and financing activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

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- Definition

Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585

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Acquisitions and Dispositions Dispositions (Details) $ in Thousands, sqft in Millions	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) a sqft	Sep. 30, 2015 USD ($) a buildings	Sep. 30, 2014 USD ($)	Dec. 31, 2014 buildings
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 1,534,177	$ 386,215
Number of Real Estate Properties Sold \| buildings		140		29
Mortgage note receivable from buyer in property sale		$ 204,428	$ 0
Suburban Office Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 1,070,000
Gains (Losses) on Sale of Real Estate	$ 398,600
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft	6.7
Number of Real Estate Properties Sold \| buildings		61
Area of Land \| a	57	57
Mortgage note receivable from buyer in property sale		$ 200,000
Industrial Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 270,000
Gains (Losses) on Sale of Real Estate	$ 107,300
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft	5.2
Number of Real Estate Properties Sold \| buildings		51
London Interbank Offered Rate (LIBOR) [Member] \| Suburban Office Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
Debt Instrument, Basis Spread on Variable Rate		1.50%