Net Income (Loss) Per Common Share Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 39,820	$ 71,053	$ 59,276	$ 115,604
Less: dividends on participating securities	(356)	(388)	(712)	(777)
Basic net income attributable to common shareholders	39,464	70,665	58,564	114,827
Add back dividends on dilutive participating securities	0	0	0	0
Noncontrolling interest in earnings of common unitholders	356	621	526	1,003
Diluted net income attributable to common shareholders	$ 39,820	$ 71,286	$ 59,090	$ 115,830
Weighted average number of common shares/units outstanding, Basic	368,836	359,681	368,513	359,412
Weighted average Limited Partner Units outstanding	3,331	3,145	3,277	3,105
Other potential dilutive shares/units	406	100	407	98
Weighted average number of common shares/units and potential dilutive securities	372,573	362,926	372,197	362,615
Duke Realty Limited Partnership [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 40,176	$ 71,674	$ 59,802	$ 116,607
Less: dividends on participating securities	(356)	(388)	(712)	(777)
Basic net income attributable to common unitholders	39,820	71,286	59,090	115,830
Add back dividends on dilutive participating securities	0	0	0	0
Diluted net income attributable to common unitholders	$ 39,820	$ 71,286	$ 59,090	$ 115,830
Weighted average number of common shares/units outstanding, Basic	372,167	362,826	371,790	362,517
Other potential dilutive shares/units	406	100	407	98
Weighted average number of common shares/units and potential dilutive securities	372,573	362,926	372,197	362,615