Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues [Abstract]
Rental income	$ 117,247	$ 102,294	$ 353,057	$ 294,271
Other income	48	127	403	498
Total revenue	117,295	102,421	353,460	294,769
Expenses
Property	20,817	18,157	63,156	54,623
General and administrative	9,537	8,924	29,316	26,723
Depreciation and amortization	53,921	46,908	160,215	133,844
Loss on impairments	3,172	4,413	3,172	9,757
Other expenses	436	458	1,500	1,284
Total expenses	87,883	78,860	257,359	226,231
Other income (expense)
Interest and other income	165	12	400	30
Interest expense	(15,928)	(14,053)	(46,125)	(39,080)
Loss on extinguishment of debt	0	0	(834)	0
Gain on involuntary conversion	1,500	0	2,157	0
Gain on the sales of rental property, net	9,060	1,670	56,864	3,261
Total other income (expense)	(5,203)	(12,371)	12,462	(35,789)
Net income	24,209	11,190	108,563	32,749
Less: income attributable to noncontrolling interest after preferred stock dividends	466	290	2,471	912
Net income attributable to STAG Industrial, Inc.	23,743	10,900	106,092	31,837
Less: preferred stock dividends	1,289	1,289	3,867	3,867
Less: amount allocated to participating securities	68	78	204	236
Net income attributable to common stockholders	$ 22,386	$ 9,533	$ 102,021	$ 27,734
Weighted average common shares outstanding — basic	148,997	127,272	148,412	122,460
Weighted average common shares outstanding — diluted	149,905	127,469	148,865	122,720
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$ 0.15	$ 0.07	$ 0.69	$ 0.23
Net income per share attributable to common stockholders — diluted	$ 0.15	$ 0.07	$ 0.69	$ 0.23