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, 2019 USD ($) ft²	Dec. 31, 2018 USD ($) ft²	Jun. 30, 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
RioCan Canada [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	764	924
Investments included in investments in unconsolidated joint ventures	$ 94,700	$ 96,000
Columbus [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	355	355	355
Investments included in other liabilities	$ (3,500)	$ (1,600)
Charlotte [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	399	398		398
Investments included in other liabilities	$ (13,000)	$ (10,800)
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	$ (5,900)	$ (5,100)
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	$ (19,700)	$ (15,000)
Columbus Charlotte National Harbor and Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Investments included in other liabilities	(42,100)	(32,500)
Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	368,032	367,865
Unconsolidated Properties [Member] \| RioCan Canada [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	9,200	9,300
Unconsolidated Properties [Member] \| Columbus [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	85,000	84,700
Unconsolidated Properties [Member] \| Charlotte [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	99,500	99,500
Unconsolidated Properties [Member] \| National Harbor [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	94,400	94,500
Unconsolidated Properties [Member] \| Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	79,900	79,600
Mortgages [Member] \| Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Debt origination costs and premiums	$ 1,100	$ 1,400