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	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 226,566	$ 53,025	$ 342,170	$ 319,833
Less: dividends on participating securities	(350)	(394)	(1,125)	(1,249)
Basic net income attributable to common shareholders	226,216	52,631	341,045	318,584
Add back dividends on dilutive participating securities	350	0	1,125	1,249
Noncontrolling interest in earnings of common unitholders	1,968	495	2,971	3,002
Diluted net income attributable to common shareholders	$ 228,534	$ 53,126	$ 345,141	$ 322,835
Weighted average number of common shares/units outstanding, Basic	362,416	357,898	360,424	357,235
Weighted average Limited Partner Units outstanding	3,142	3,302	3,118	3,350
Other potential dilutive shares/units	1,713	210	1,801	2,160
Weighted average number of common shares/units and potential dilutive securities	367,271	361,410	365,343	362,745
Duke Realty Limited Partnership [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 228,534	$ 53,520	$ 345,141	$ 322,835
Less: dividends on participating securities	(350)	(394)	(1,125)	(1,249)
Basic net income attributable to common unitholders	228,184	53,126	344,016	321,586
Add back dividends on dilutive participating securities	350	0	1,125	1,249
Diluted net income attributable to common unitholders	$ 228,534	$ 53,126	$ 345,141	$ 322,835
Weighted average number of common shares/units outstanding, Basic	365,558	361,200	363,542	360,585
Other potential dilutive shares/units	1,713	210	1,801	2,160
Weighted average number of common shares/units and potential dilutive securities	367,271	361,410	365,343	362,745

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