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

Annual report pursuant to Section 13 and 15(d)

Debt of the Operating Partnership - Narrative (Details)

Debt of the Operating Partnership - Narrative (Details)	1 Months Ended											3 Months Ended		12 Months Ended			21 Months Ended
Debt of the Operating Partnership - Narrative (Details)	Dec. 31, 2017 USD ($)	Aug. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Aug. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	Apr. 30, 2016 USD ($)	Feb. 29, 2016 USD ($)	Jan. 31, 2016 USD ($)	Oct. 31, 2015 USD ($)	Apr. 30, 2015 USD ($) Extension	Oct. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Nov. 30, 2017 USD ($)	Jul. 31, 2015 USD ($)	May 30, 2015 USD ($)
Mortgages [Member] \| Westgate [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate						1.75%
Tanger Properties Limited Partnership [Member]
Debt Instrument [Line Items]
Principal balance of debt	$ 1,780,562,000													$ 1,780,562,000	$ 1,705,998,000
Debt retirement make whole premium														34,143,000	0	$ 0
Tanger Properties Limited Partnership [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Collateral for mortgages payable	193,100,000													193,100,000
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| Atlantic City Outlets The Walk [Member]
Debt Instrument [Line Items]
Principal balance of debt	37,462,000													37,462,000	40,471,000
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| Westgate [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt					$ 62,000,000
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| Ocean City Factory Outlets [Member]
Debt Instrument [Line Items]
Principal balance of debt																			$ 17,600,000
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| The Outlets at Hershey [Member]
Debt Instrument [Line Items]
Principal balance of debt																				$ 29,000,000
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| Southaven [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity											$ 60,000,000
Principal balance of debt	60,000,000													$ 60,000,000	59,277,000
Number of mortgage extensions \| Extension											1
Term of debt extension											2 years
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| Southaven [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate											1.75%			1.75%
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| Foxwoods [Member]
Debt Instrument [Line Items]
Principal balance of debt	0													$ 0	70,250,000			$ 70,300,000
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| Foxwoods [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate														1.55%
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| Deer Park [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt									$ 150,000,000
Tanger Properties Limited Partnership [Member] \| Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Principal balance of debt						$ 10,000,000
Tanger Properties Limited Partnership [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity	520,000,000													$ 520,000,000
Liquidity Line, Maximum Borrowings	20,000,000													20,000,000
Syndicated Line, Maximum Borrowings	500,000,000													500,000,000
Line of Credit Facility, Syndicated Line, Potential Maximum Borrowings if Accordion Feature is Utilized	1,000,000,000.0													1,000,000,000.0
Letters of Credit Outstanding, Amount	6,000,000													$ 6,000,000
Percentage of funds from operations allowed on a cumulative basis required for debt covenants														95.00%
Principal balance of debt	$ 208,100,000													$ 208,100,000	61,000,000
Line of Credit Facility, Syndicated Line, Amount That The Line May Be Increased										$ 1,000,000,000							$ 750,000,000
Payments of Debt Issuance Costs										$ 2,000,000.0
Tanger Properties Limited Partnership [Member] \| Line of Credit [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.90%									0.90%				0.90%			1.00%
Tanger Properties Limited Partnership [Member] \| Unsecured Term Note [Member]
Debt Instrument [Line Items]
Repayments of Long-term Debt								$ 7,500,000
Tanger Properties Limited Partnership [Member] \| Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Syndicated Line, Potential Maximum Borrowings if Accordion Feature is Utilized							$ 175,000,000						$ 150,000,000
Principal balance of debt	$ 325,000,000						$ 325,000,000						$ 250,000,000	$ 325,000,000	325,000,000
Tanger Properties Limited Partnership [Member] \| Unsecured Term Loan [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Basis spread on variable rate							0.95%						1.05%	0.95%
Tanger Properties Limited Partnership [Member] \| Senior Notes [Member] \| 3.125% Senior Notes $250 million [Member]
Debt Instrument [Line Items]
Principal balance of debt					$ 250,000,000
Notes price at percentage of the principal amount					99.605%
Yield to maturity					3.171%
Tanger Properties Limited Partnership [Member] \| Senior Notes [Member] \| 3.125% Senior Notes 100 million [Member]
Debt Instrument [Line Items]
Notes price at percentage of the principal amount				98.962%
Yield to maturity				3.248%
Additional principal amount				$ 100,000,000								$ 100,000,000
Tanger Properties Limited Partnership [Member] \| Senior Notes [Member] \| 3.125% 2026 Senior Notes [Member]
Debt Instrument [Line Items]
Principal balance of debt	$ 350,000,000													$ 350,000,000	350,000,000
Stated Interest Rate(s)	3.125%			3.125%								3.125%		3.125%
Proceeds from Issuance of Long-term Debt												$ 344,500,000
Tanger Properties Limited Partnership [Member] \| Senior Notes [Member] \| 3.75% 2024 Senior Notes [Member]
Debt Instrument [Line Items]
Principal balance of debt	$ 250,000,000													$ 250,000,000	250,000,000
Stated Interest Rate(s)	3.75%													3.75%
Tanger Properties Limited Partnership [Member] \| Senior Notes [Member] \| 3.875% 2023 Senior Notes [Member]
Debt Instrument [Line Items]
Principal balance of debt	$ 250,000,000													$ 250,000,000	250,000,000
Stated Interest Rate(s)	3.875%													3.875%
Tanger Properties Limited Partnership [Member] \| Senior Notes [Member] \| 3.875% 2027 Senior Notes [Member]
Debt Instrument [Line Items]
Principal balance of debt	$ 300,000,000		$ 300,000,000											$ 300,000,000	0
Stated Interest Rate(s)	3.875%		3.875%											3.875%
Notes price at percentage of the principal amount			99.579%
Yield to maturity			3.926%
Proceeds from Issuance of Long-term Debt			$ 295,900,000
Tanger Properties Limited Partnership [Member] \| Senior Notes [Member] \| 6.125% 2020 Senior Notes [Member]
Debt Instrument [Line Items]
Principal balance of debt	$ 0	$ 300,000,000												$ 0	$ 300,000,000
Stated Interest Rate(s)	6.125%	6.125%												6.125%
Debt retirement make whole premium		$ 34,100,000
Write off of debt discount and deferred debt issuance costs		$ 1,500,000
Tanger Properties Limited Partnership [Member] \| Debt [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Maximum Borrowing Capacity	$ 520,000,000													$ 520,000,000
Savannah [Member]
Debt Instrument [Line Items]
Mortgage loan					$ 96,900,000
Savannah [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Basis spread on variable rate					1.65%