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Significant Acquisitions and Dispositions (Narrative) (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
a
buildings
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
a
buildings
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
a
buildings
Dec. 31, 2017
USD ($)
a
sqft
buildings
Dec. 31, 2016
USD ($)
sqft
buildings
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 24,996,000       $ 46,807,000       $ 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       $ 353,122,000 $ 992,651,000 102,851,000
Square Footage Of Real Estate Properties Acquired Or Disposed | sqft                   3,400,000  
Percentage of property leased                   68.90%  
Area of Land | a 7               7    
Proceeds from Sale of Real Estate Held-for-investment                 $ 511,391,000 $ 2,523,358,000 538,892,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings $ 328,126,000       945,844,000       $ 328,126,000 $ 945,844,000 $ 94,783,000
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
Business Combination, Consideration Transferred                     $ 131,300,000
Rental and related revenue $ 202,858,000 $ 196,912,000 $ 192,093,000 $ 193,456,000 $ 179,391,000 $ 169,611,000 $ 165,836,000 $ 171,676,000 $ 785,319,000 $ 686,514,000 641,701,000
Operating Income (Loss)                 460,356,000 388,621,000 433,312,000
Promote income                 $ 0 $ 20,007,000 $ 26,299,000
Number of Real Estate Properties | buildings 9       28       9 28 18
Acquisition-related activity                 $ 0 $ 0 $ (7,176,000)
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain                 0 0 7,272,000
Gain on dissolution of unconsolidated joint venture                 0 0 30,697,000
Investments in and advances to unconsolidated joint ventures $ 110,795,000       $ 126,487,000       110,795,000 126,487,000  
Payments to Acquire Real Estate                 (348,107,000) (982,598,000) $ (170,635,000)
Below Market Lease, Gross 505,000       1,483,000       505,000 1,483,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 352,617,000       $ 991,168,000       $ 352,617,000 $ 991,168,000  
Other [Member]                      
Business Acquisition [Line Items]                      
Number of Real Estate Properties | buildings                     3
Bridge Portfolio [Member]                      
Business Acquisition [Line Items]                      
Area of Land | a         43         43  
Number of Real Estate Properties | buildings         10         10  
Payments to Acquire Real Estate                   $ (578,400,000)  
Gramercy Property Trust [Member]                      
Business Acquisition [Line Items]                      
Number of Real Estate Properties | buildings                     7
Other 2016 Acquisitions [Member]                      
Business Acquisition [Line Items]                      
Rental and related revenue                     $ 5,100,000
Operating Income (Loss)                     1,100,000
Duke/Quantico LLC [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill                     16,724,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets                     137,206,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings                     120,608,000
Business Combination, Consideration Transferred                     $ 131,250,000
Number of Real Estate Properties | buildings                     14
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain                     $ 5,956,000
Investments in and advances to unconsolidated joint ventures                     0
Duke Realty Limited Partnership [Member]                      
Business Acquisition [Line Items]                      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Buildings                     63,000,000
Proceeds from Divestiture of Businesses and Interests in Affiliates                     $ 2,760,000
Number of Real Estate Properties | buildings                     1
Gain on dissolution of unconsolidated joint venture                     $ 30,697,000
Duke/Hulfish LLC [Member]                      
Business Acquisition [Line Items]                      
Number of Real Estate Properties | buildings                     8
Duke/Hulfish LLC [Member]                      
Business Acquisition [Line Items]                      
Equity Method Investment, Ownership Percentage                     20.00%
Office Building [Member] | Duke/Quantico LLC [Member]                      
Business Acquisition [Line Items]                      
Number of Real Estate Properties | buildings                     3
Industrial [Member] | Duke/Quantico LLC [Member]                      
Business Acquisition [Line Items]                      
Number of Real Estate Properties | buildings                     11
Office Building [Member] | Duke/Quantico LLC [Member]                      
Business Acquisition [Line Items]                      
Square Footage Of Real Estate Properties Acquired Or Disposed | sqft                     241,000
Proceeds from Sale of Real Estate Held-for-investment                     $ 53,400,000