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, 2018 USD ($) ft²	Dec. 31, 2017 USD ($) ft²	Jun. 30, 2016 ft²	Jul. 31, 2014 ft²	Nov. 30, 2013 ft²	Oct. 31, 2012 ft²
RioCan Canada [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	924	923
Investments included in investments in unconsolidated joint ventures	$ 96,000	$ 115,800
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		$ 1,100
Investments included in other liabilities	$ (1,600)
Charlotte [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	398	398		398
Investments included in other liabilities	$ (10,800)	$ (4,100)
National Harbor [Member]
Schedule of Equity Method Investments [Line Items]
Ownership %	50.00%	50.00%
Square Feet \| ft²	341	341			341
Investments included in investments in unconsolidated joint ventures		$ 2,500
Investments included in other liabilities	$ (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	$ (15,000)	$ (13,000)
Columbus Charlotte National Harbor and Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Investments included in other liabilities	(32,500)
Columbus National Harbor and RioCan Canada [Member]
Schedule of Equity Method Investments [Line Items]
Investments included in investments in unconsolidated joint ventures		119,400
Charlotte and Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Investments included in other liabilities		(17,100)
Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	367,865	351,259
Unconsolidated Properties [Member] \| RioCan Canada [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	9,300	11,100
Unconsolidated Properties [Member] \| Columbus [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	84,700	84,400
Unconsolidated Properties [Member] \| Charlotte [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	99,500	89,800
Unconsolidated Properties [Member] \| National Harbor [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	94,500	86,400
Unconsolidated Properties [Member] \| Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Total Joint Venture Debt, Net	79,600	79,400
Mortgages [Member] \| Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Debt origination costs and premiums	$ 1,400	$ 1,400