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

Annual report pursuant to Section 13 and 15(d)

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

Investments in Unconsolidated Real Estate Joint Ventures - Narrative (Details) ft² in Thousands, $ in Thousands	1 Months Ended			3 Months Ended	6 Months Ended	12 Months Ended
	Jul. 31, 2017 USD ($) Extension	Nov. 30, 2016 USD ($) Extension	Feb. 28, 2015 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2017 USD ($) ft²	Dec. 31, 2017 USD ($) ft²	Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($)	Jun. 30, 2016 ft²	May 31, 2016 ft²	Mar. 31, 2016 ft²	Nov. 30, 2014 ft²	Jul. 31, 2014 ft²	Nov. 30, 2013 ft²	Oct. 31, 2012 ft²
Schedule of Equity Method Investments [Line Items]
Difference in basis						$ 4,200	$ 3,700
Charlotte [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²						398	398						398
Ownership %						50.00%	50.00%
Columbus [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²						355	355		355
Ownership %						50.00%	50.00%
Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²						353	353								353
Ownership %						50.00%	50.00%
National Harbor [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²						341	341							341
Ownership %						50.00%	50.00%
RioCan Canada [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²						923	901
Ownership %						50.00%	50.00%
Ottawa [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²											316
Square feet of anchor tenant \| ft²											28
Estimated square feet of expansion \| ft²					39
Cookstown [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²												308
Estimated square feet of expansion \| ft²												149
Les Factoreries St. Sauveur Property [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²						116
Bromont Outlet Mall Property [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²						161
Non-cash impairment charge							$ 5,800
Company's share of impairment charge							2,900
Savannah [Member]
Schedule of Equity Method Investments [Line Items]
Square Feet \| ft²										429
Estimated square feet of expansion \| ft²										42
Wisconsin Dells [Member]
Schedule of Equity Method Investments [Line Items]
Net sales price from sale of joint venture			$ 15,600
Company's share of sales price of sale of joint venture			27,700
Company's share of joint venture debt			$ 12,100
Gain on sale of assets and interests in unconsolidated entities				$ 13,700
Unconsolidated Properties [Member]
Schedule of Equity Method Investments [Line Items]
Non-cash impairment charge						$ 18,042	$ 5,838	$ 0
Unconsolidated Properties [Member] \| Bromont and Les Factories St. Sauveur [Member]
Schedule of Equity Method Investments [Line Items]
Non-cash impairment charge						18,000
Company's share of impairment charge						9,000
Unconsolidated Properties [Member] \| Mortgages [Member] \| Charlotte [Member]
Schedule of Equity Method Investments [Line Items]
Principal						$ 90,000
Basis spread on variable rate						1.45%
Term of debt extension						1 year
Unconsolidated Properties [Member] \| Mortgages [Member] \| Columbus [Member]
Schedule of Equity Method Investments [Line Items]
Principal		$ 85,000
Basis spread on variable rate		1.65%
Term of debt extension		1 year
Proceeds from joint venture debt		$ 84,200
Number of mortgage extensions \| Extension		2
Unconsolidated Properties [Member] \| Mortgages [Member] \| Galveston/Houston [Member]
Schedule of Equity Method Investments [Line Items]
Principal	$ 80,000				$ 70,000
Basis spread on variable rate	1.65%				1.50%
Term of debt extension	1 year
Proceeds from joint venture debt	$ 14,500
Number of mortgage extensions \| Extension	2
Unconsolidated Properties [Member] \| Mortgages [Member] \| National Harbor [Member]
Schedule of Equity Method Investments [Line Items]
Maximum Borrowing Capacity						$ 87,000
Unconsolidated Properties [Member] \| National Harbor [Member] \| Mortgages [Member]
Schedule of Equity Method Investments [Line Items]
Basis spread on variable rate						1.65%