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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 71,053	$ 193,845	$ 115,604	$ 266,808
Less: dividends on participating securities	(388)	(418)	(777)	(855)
Basic net income attributable to common shareholders	70,665	193,427	114,827	265,953
Add back dividends on dilutive participating securities	0	418	0	855
Noncontrolling interest in earnings of common unitholders	621	1,824	1,003	2,507
Diluted net income attributable to common shareholders	$ 71,286	$ 195,669	$ 115,830	$ 269,315
Weighted average number of common shares/units outstanding, Basic	359,681	357,054	359,412	356,898
Weighted average Limited Partner Units outstanding	3,145	3,393	3,105	3,374
Other potential dilutive shares/units	100	2,294	98	2,279
Weighted average number of common shares/units and potential dilutive securities	362,926	362,741	362,615	362,551
Duke Realty Limited Partnership [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 71,674	$ 195,669	$ 116,607	$ 269,315
Less: dividends on participating securities	(388)	(418)	(777)	(855)
Basic net income attributable to common unitholders	71,286	195,251	115,830	268,460
Add back dividends on dilutive participating securities	0	418	0	855
Diluted net income attributable to common unitholders	$ 71,286	$ 195,669	$ 115,830	$ 269,315
Weighted average number of common shares/units outstanding, Basic	362,826	360,447	362,517	360,272
Other potential dilutive shares/units	100	2,294	98	2,279
Weighted average number of common shares/units and potential dilutive securities	362,926	362,741	362,615	362,551