Dispositions Disclosures [Line Items]

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- Definition

Number of Unconsolidated Joint Ventures in which Equity Interests Held

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No definition available.

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- Definition

Number of Real Estate Properties Sold

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- Definition

Square Footage Of Real Estate Properties Acquired Or Disposed.

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- Definition

Area of land held.

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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

Contractual interest rate for funds borrowed, under the debt agreement.

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- Definition

Amount of tax expense (benefit) related to a discontinued operation. Includes, but is not limited to, tax expense (benefit) related to income (loss) from operations during the phase-out period, tax expense (benefit) related to gain (loss) on disposal, tax expense (benefit) related to gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and tax expense (benefit) related to adjustments of a prior period gain (loss) on disposal.

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- Definition

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

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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- Definition

Amount of current tax expense (benefit) and deferred tax expense (benefit) pertaining to income (loss) from continuing operations and income (loss) from discontinued operations.

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- Definition

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

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- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

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- Definition

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

+ References

No definition available.

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- Definition

Amount of distribution received from equity method investee for return of investment, classified as investing activities. Excludes distribution for return on investment, classified as operating activities.

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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.

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Amount of revenue recognized from investments in real estate partnerships and variable interest entities.

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No definition available.

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Significant Acquisitions and Dispositions Dispositions (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017 USD ($) buildings entities	Dec. 31, 2017 USD ($) sqft buildings entities	Dec. 31, 2016 USD ($) sqft buildings	Dec. 31, 2015 USD ($) a sqft buildings
Dispositions Disclosures [Line Items]
Number of Real Estate Properties \| buildings	28	28	3	2
Proceeds from Sale of Real Estate Held-for-investment		$ 2,521,078	$ 538,642	$ 1,675,690
Debt Instrument, Interest Rate, Stated Percentage	3.38%	3.38%	3.25%
Notes receivable from property sales	$ 426,657	$ 426,657	$ 25,460
Notes receivable from buyers in property sales		$ 404,846	$ 23,360	$ 204,336
Number of Real Estate Properties Sold \| buildings		98	32	153
Number of Unconsolidated Joint Ventures in which Equity Interests Held \| entities	9	9
Equity in earnings (loss) of unconsolidated joint ventures		$ 63,310	$ 47,403	$ (3,304)
Promote income		20,007	26,299	0
Income Tax Expense (Benefit), Continuing Operations, Discontinued Operations		17,700
Discontinued Operation, Tax Effect of Discontinued Operation		12,465	0	3,175
Income Tax Expense (Benefit)		(357)	(589)	(3,928)
Proceeds from Equity Method Investment, Distribution, Return of Capital		$ 124,956	$ 126,051	68,985
Square Footage Of Real Estate Properties Acquired Or Disposed \| sqft		3,400,000
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
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]
Dispositions Disclosures [Line Items]
Debt Instrument, Description of Variable Rate Basis		LIBOR
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]
Dispositions Disclosures [Line Items]
Number of Real Estate Properties \| buildings			14
Duke/Quantico LLC [Member] \| Industrial [Member]
Dispositions Disclosures [Line Items]
Number of Real Estate Properties \| buildings			11
Duke/Quantico LLC [Member] \| Office Building [Member]
Dispositions Disclosures [Line Items]
Number of Real Estate Properties \| buildings			3
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
Medical Office Portfolio Sale [Member]
Dispositions Disclosures [Line Items]
Proceeds from Sale of Real Estate Held-for-investment	$ 178,500	$ 2,780,000
Debt Instrument, Interest Rate, Stated Percentage	4.00%	4.00%
Gains (Losses) on Sales of Investment Real Estate	$ 128,000	$ 1,390,000
Notes receivable from property sales	$ 400,000	$ 400,000
Number of Real Estate Properties Sold \| buildings	1	85
Number of Unconsolidated Joint Ventures in which Equity Interests Held \| entities	2	2
Equity in earnings (loss) of unconsolidated joint ventures		$ 47,500
Proceeds from Equity Method Investment, Distribution, Return of Capital		105,300
Continuing Operations [Member]
Dispositions Disclosures [Line Items]
Income Tax Expense (Benefit)		$ 5,200
BCC Cancer Center Venture, L.P. [Member]
Dispositions Disclosures [Line Items]
Number of Unconsolidated Joint Ventures in which Equity Interests Held \| entities	1	1