Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues [Abstract]
Rental income	$ 117,471	$ 96,362	$ 235,810	$ 191,977
Other income	146	284	355	371
Total revenue	117,617	96,646	236,165	192,348
Expenses
Property	20,392	16,955	42,339	36,466
General and administrative	9,406	8,587	19,779	17,799
Depreciation and amortization	53,606	44,633	106,294	86,936
Loss on impairments	0	0	0	5,344
Other expenses	588	427	1,064	826
Total expenses	83,992	70,602	169,476	147,371
Other income (expense)
Interest and other income	156	2	235	18
Interest expense	(15,333)	(12,193)	(30,197)	(25,027)
Loss on extinguishment of debt	(834)	0	(834)	0
Gain on involuntary conversion	657	0	657	0
Gain on the sales of rental property, net	1,045	317	47,804	1,591
Total other income (expense)	(14,309)	(11,874)	17,665	(23,418)
Net income	19,316	14,170	84,354	21,559
Less: income attributable to noncontrolling interest after preferred stock dividends	407	408	2,005	622
Net income attributable to STAG Industrial, Inc.	18,909	13,762	82,349	20,937
Less: preferred stock dividends	1,289	1,289	2,578	2,578
Less: amount allocated to participating securities	68	79	136	158
Net income attributable to common stockholders	$ 17,552	$ 12,394	$ 79,635	$ 18,201
Weighted average common shares outstanding — basic	148,663	125,251	148,116	120,015
Weighted average common shares outstanding — diluted	149,027	125,560	148,341	120,306
Net income per share — basic and diluted
Net income per share attributable to common stockholders — basic	$ 0.12	$ 0.10	$ 0.54	$ 0.15
Net income per share attributable to common stockholders — diluted	$ 0.12	$ 0.10	$ 0.54	$ 0.15