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
Debt of the Operating Partnership - Narrative (Details)	Sep. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Feb. 29, 2020 USD ($)	Jan. 31, 2020	Oct. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	Jan. 31, 2018 USD ($)	Aug. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	May 31, 2020	Mar. 31, 2018 USD ($)
Debt Instrument [Line Items]
Maximum thresholds for total leverage and unsecured leverage				0.65											0.60
Netting of cash balances in excess				$ 30,000,000.0
Property Management Fee, Percent Fee				3.00%
LIBOR floor interest rate				0.25%
Repayments of Long-term Lines of Credit											$ 599,800,000
Tanger Properties Limited Partnership [Member]
Debt Instrument [Line Items]
Proceeds from revolving credit facility												$ 641,630,000	$ 282,870,000	$ 491,900,000
Repayments of Long-term Lines of Credit												641,630,000	427,970,000	$ 554,900,000
Principal balance of debt												1,578,743,000	1,582,309,000
Tanger Properties Limited Partnership [Member] \| Mortgages [Member]
Debt Instrument [Line Items]
Collateral for mortgages payable												166,000,000.0
Tanger Properties Limited Partnership [Member] \| Mortgages [Member] \| Southaven [Member]
Debt Instrument [Line Items]
Term of debt extension									2 years
Principal balance of debt		$ 60,000,000.0							$ 51,400,000	$ 60,000,000.0		$ 51,400,000	51,400,000
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%							1.80%			1.80%
Tanger Properties Limited Partnership [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Liquidity Line, Maximum Borrowings												$ 20,000,000.0
Syndicated Line, Maximum Borrowings												580,000,000.0
Line of Credit Facility, Syndicated Line, Potential Maximum Borrowings if Accordion Feature is Utilized		$ 1,200,000,000	$ 1,000,000,000.0							$ 1,200,000,000		$ 1,200,000,000
Percentage of funds from operations allowed on a cumulative basis required for debt covenants												95.00%
Term of debt extension												1 year
Proceeds from revolving credit facility					$ 599,800,000
Principal balance of debt												$ 0	0
Facility fee percentage						0.20%	0.15%
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%			1.00%	0.875%			0.875%		1.00%
Tanger Properties Limited Partnership [Member] \| Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Principal balance of debt	$ 325,000,000.0					$ 350,000,000.0		$ 350,000,000.0				$ 350,000,000	$ 350,000,000
Proceeds from debt								$ 25,000,000.0
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%					1.00%	0.90%	0.90%				1.00%
Tanger Properties Limited Partnership [Member] \| Debt [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity		600,000,000.0	$ 520,000,000.0			$ 600,000,000.0				$ 600,000,000.0		$ 600,000,000.0
Loan origination costs		$ 2,300,000								$ 2,300,000
Designated as Hedging Instrument [Member]
Debt Instrument [Line Items]
Notional Amount												$ 640,000,000
Designated as Hedging Instrument [Member] \| Southaven [Member]
Debt Instrument [Line Items]
Derivative, Fixed Interest Rate																2.47%
Notional Amount																$ 40,000,000.0