Tanger Inc. Annual report pursuant to Section 13 and 15(d)

Investments in Unconsolidated Real Estate Joint Ventures - Unconsolidated Real Estate Joint Ventures (Details)

Investments in Unconsolidated Real Estate Joint Ventures - Unconsolidated Real Estate Joint Ventures (Details) ft² in Thousands, $ in Thousands	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2016 ft²	Jul. 31, 2014 ft²	Nov. 30, 2013 ft²	Oct. 31, 2012 ft²
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²	878
Columbus [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	355	355	355
Investments included in investments in unconsolidated joint ventures	$ 2,000
Investments included in other liabilities		$ (3,500)
RioCan Canada [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	765	764
Investments included in investments in unconsolidated joint ventures	$ 92,600	$ 94,700
Charlotte [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	399	399		398
Investments included in other liabilities	$ (12,800)	$ (13,000)
National Harbor [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	341	341			341
Investments included in other liabilities	$ (8,400)	$ (5,900)
Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	353	353				353
Investments included in other liabilities	$ (19,500)	$ (19,700)
Columbus Charlotte National Harbor and Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Investments included in other liabilities		(42,100)
Charlotte, National Harbor and Galveston/Houston
Schedule of Equity Method Investments [Line Items]
Investments included in other liabilities	(40,700)
Columbus and Rio Can
Schedule of Equity Method Investments [Line Items]
Investments included in investments in unconsolidated joint ventures	94,600
Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	344,856	368,032
Unconsolidated Properties [Member] \| Columbus [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	70,800	85,000
Unconsolidated Properties [Member] \| RioCan Canada [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	0	9,200
Unconsolidated Properties [Member] \| Charlotte [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	99,600	99,500
Unconsolidated Properties [Member] \| National Harbor [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	94,500	94,400
Unconsolidated Properties [Member] \| Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	80,000	79,900
Mortgages [Member] \| Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Debt origination costs and premiums	$ 1,100	$ 1,100