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

Disposition of Property (Details)	3 Months Ended	12 Months Ended
Disposition of Property (Details)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($) ft²	Dec. 31, 2017 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet \| ft²		878,000
Net Sales Price		$ 128,505,000
Gain on sale of assets		$ 43,422,000
Nags Head, Ocean City, Park City & Williamsburg [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet \| ft²		878,000
Net Sales Price		$ 128,248,000
Gain on sale of assets	$ 43,400,000	$ 43,422,000
Land outparcel [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet \| ft²		0
Net Sales Price		$ 257,000
Gain on sale of assets		$ 0
Westbrook [Member] \| Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square Feet \| ft²			290,000
Net Sales Price			$ 39,213,000
Gain on sale of assets			$ 6,943,000