Investments in Unconsolidated Real Estate Joint Ventures (Summary Statements of Operations for Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Unconsolidated Properties [Member]
Summary Statements of Operations of Unconsolidated Joint Ventures [Line Items]
Revenues	$ 16,959	$ 23,050	$ 55,470	$ 70,088
Expenses:
Property operating	8,035	8,380	24,023	27,780
General and administrative	82	19	344	171
Impairment charge	0		6,181	0
Depreciation and amortization	5,877	6,051	17,686	18,478
Total expenses	13,994	14,450	48,234	46,429
Interest expense	(3,024)	(4,059)	(9,991)	(12,331)
Other income (expense)	104	179	165	305
Total other income (expense)	(2,920)	(3,880)	(9,826)	(12,026)
Net income (loss)	45	4,720	(2,590)	11,633
Tanger Factory Outlet Centers, Inc. [Member]
Summary Statements of Operations of Unconsolidated Joint Ventures [Line Items]
Revenues	103,213	118,994	278,836	357,856
Expenses:
Property operating	35,206	39,149	101,991	118,252
General and administrative	11,181	12,292	35,331	40,910
Impairment charge	0	0	45,675	0
Depreciation and amortization	29,903	30,103	87,966	93,009
Total expenses	76,290	81,544	270,963	252,171
Interest expense	(15,647)	(15,197)	(47,786)	(46,638)
Other income (expense)	161	227	789	(2,966)
Total other income (expense)	(13,162)	(14,970)	(44,673)	(6,182)
Net income (loss)	13,719	24,809	(38,290)	105,107
The Company and Operating Partnership's share of:
Net income (loss)	(42)	2,329	(1,490)	5,604
Depreciation and amortization (real estate related)	$ 3,003	$ 3,058	$ 9,038	$ 9,453