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
Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 44,551	$ 72,963
Less: dividends on participating securities	(388)	(437)
Basic net income attributable to common shareholders	44,163	72,526
Add back dividends on dilutive participating securities	0	0
Noncontrolling interest in earnings of common unitholders	382	683
Diluted net income attributable to common shareholders	$ 44,545	$ 73,209
Weighted average number of common shares/units outstanding, Basic	359,139	356,740
Weighted average Limited Partner Units outstanding	3,065	3,355
Other potential dilutive shares/units	158	305
Weighted average number of common shares/units and potential dilutive securities	362,362	360,400
Duke Realty Limited Partnership [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 44,933	$ 73,646
Less: dividends on participating securities	(388)	(437)
Basic net income attributable to common unitholders	44,545	73,209
Add back dividends on dilutive participating securities	0	0
Diluted net income attributable to common unitholders	$ 44,545	$ 73,209
Weighted average number of common shares/units outstanding, Basic	362,204	360,095
Other potential dilutive shares/units	158	305
Weighted average number of common shares/units and potential dilutive securities	362,362	360,400

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