Significant Acquisitions and Dispositions (Summary of Allocation of Fair Value of Amounts Recognized) (Details)	12 Months Ended
Dec. 31, 2018 USD ($) buildings	Dec. 31, 2017 USD ($) buildings	Dec. 31, 2016 USD ($) buildings
Payments to Acquire Real Estate	$ 348,107,000	$ 982,598,000	$ 170,635,000
Number of Real Estate Properties \| buildings	9	28	18
Real estate assets	$ 328,126,000	$ 945,844,000	$ 94,783,000
Lease-related intangible assets	24,996,000	46,807,000	8,068,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	353,122,000	992,651,000	102,851,000
Below Market Lease, Gross	505,000	1,483,000
Business Combination, Consideration Transferred			(131,300,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	352,617,000	991,168,000
Investments in and advances to unconsolidated companies	(110,795,000)	(126,487,000)
Gain on dissolution of unconsolidated joint venture	0	0	30,697,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain	$ 0	$ 0	$ 7,272,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	11 years 3 months 4 days	8 years 8 months 4 days	7 years 1 month 4 days
Duke/Quantico LLC [Member]
Number of Real Estate Properties \| buildings			14
Real estate assets			$ 120,608,000
Lease-related intangible assets			16,724,000
Net working capital liabilities			(126,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			137,206,000
Business Combination, Consideration Transferred			(131,250,000)
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value			5,956,000
Investments in and advances to unconsolidated companies			0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain			$ 5,956,000
Duke Realty Limited Partnership [Member]
Number of Real Estate Properties \| buildings			1
Real estate assets			$ 63,000,000
Proceeds from Divestiture of Businesses and Interests in Affiliates			2,760,000
Equity Method Investments			(35,063,000)
Gain on dissolution of unconsolidated joint venture			$ 30,697,000

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Net working capital liabilities

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No definition available.

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount before amortization of leases acquired as part of a real property acquisition at below market lease rate with a finite life.

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No definition available.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of assets acquired at the acquisition date.

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Amount of facility held for productive use including, but not limited to, office, production, storage and distribution facilities, acquired at the acquisition date.

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Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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The carrying amount of investments in unconsolidated real estate and other joint ventures not separately presented. This includes direct and indirect investments.

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