Dispositions Disclosures [Line Items]

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- Definition

Earnings from Depreciated Property Sales Share of Joint Venture

+ References

No definition available.

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- Definition

Number of Unconsolidated Joint Ventures in which Equity Interests Held

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- Definition

Number of Real Estate Properties Sold

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No definition available.

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- Definition

Square Footage Of Real Estate Properties Acquired Or Disposed.

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No definition available.

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- Definition

Area of land held.

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No definition available.

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- Definition

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

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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.

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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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-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 dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

+ References

No definition available.

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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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Significant Acquisitions and Dispositions Dispositions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) a sqft buildings entities	Dec. 31, 2015 USD ($) a sqft buildings	Dec. 31, 2014 USD ($) sqft buildings entities
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment	$ 538,642	$ 1,675,690	$ 493,217
Area of Land \| a	39
Mortgage notes receivable from buyers in property sales	$ 23,360	$ 204,336	$ 0
Number of Real Estate Properties Sold \| buildings	32	153	29
Number of Unconsolidated Joint Ventures in which Equity Interests Held \| entities	13
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	$ 126,051	$ 68,985	$ 91,750
Earnings from Depreciated Property Sales Share of Joint Venture			$ 84,600
Unconsolidated Properties [Member]
Dispositions Disclosures [Line Items]
Number of Unconsolidated Joint Ventures in which Equity Interests Held \| entities			6
Unconsolidated Properties [Member] \| Industrial [Member]
Dispositions Disclosures [Line Items]
Number of Real Estate Properties Sold \| buildings			11
Unconsolidated Properties [Member] \| Office Building [Member]
Dispositions Disclosures [Line Items]
Number of Real Estate Properties Sold \| buildings			11
Unconsolidated Properties [Member] \| Retail [Member]
Dispositions Disclosures [Line Items]
Number of Real Estate Properties Sold \| buildings			1
Atlanta Georgia [Member] \| Unconsolidated Properties [Member] \| Office Building [Member]
Dispositions Disclosures [Line Items]
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft			436,000
St. Louis Park, Minnesota [Member] \| Unconsolidated Properties [Member] \| Office Building [Member]
Dispositions Disclosures [Line Items]
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft			382,000
Cincinnati [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment			$ 150,500
Number of Real Estate Properties Sold \| buildings			6
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft			1,000,000
South Florida [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment			$ 128,000
Number of Real Estate Properties Sold \| buildings			2
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft			466,000
Industrial Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		270,000
Gains (Losses) on Sales of Investment Real Estate		$ 107,400
Number of Real Estate Properties Sold \| buildings		51
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft		5,200,000
Suburban Office Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment		$ 1,070,000
Gains (Losses) on Sales of Investment Real Estate		$ 406,100
Area of Land \| a		57
Mortgage notes receivable from buyers in property sales		$ 200,000
Number of Real Estate Properties Sold \| buildings		61
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft		6,700,000
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%
Duke/Quantico LLC [Member] \| Office Building [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment	$ 53,400
Number of Real Estate Properties Sold \| buildings	1
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft	241,000