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Debt of the Operating Partnership (Narrative) (Details) - USD ($) | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Feb. 28, 2021 | Dec. 31, 2020
Minimum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent of guaranty of completion and principal guaranty | 5.00% | 5.00% |  |  |
Maximum [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percent of guaranty of completion and principal guaranty | 100.00% | 100.00% |  |  |
Tanger Properties Limited Partnership [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Other Long-term Debt |  | $ 25,924,000 | $ 873,000 |  |
Principal | $ 1,552,820,000 | 1,552,820,000 |  |  | $ 1,578,743,000
Tanger Properties Limited Partnership [Member] | Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Net book value of collateral for mortgages payable | 161,700,000 | 161,700,000 |  |  |
Tanger Properties Limited Partnership [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of Credit Facility, Liquidity Line, Maximum Borrowings, Included in Total Line of Credit Maximum Borrowings | 20,000,000.0 | 20,000,000.0 |  |  |
Line of Credit Facility, Syndicated Line, Maximum Borrowings, Included in Total Line of Credit Maximum Borrowings | 580,000,000.0 | 580,000,000.0 |  |  |
Line of Credit Facility, Syndicated Line, Potential Maximum Borrowings if Accordion Feature is Utilized | 1,200,000,000 | $ 1,200,000,000 |  |  |
Percentage of funds from operations allowed on a cumulative basis to pay dividends |  | 95.00% |  |  |
Principal | 0 | $ 0 |  |  | 0
Tanger Properties Limited Partnership [Member] | Unsecured Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Other Long-term Debt | 25,000,000.0 |  |  |  |
Principal | 325,000,000 | 325,000,000 |  | $ 350,000,000.0 | 350,000,000
Tanger Properties Limited Partnership [Member] | Debt [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit borrowing capacity | 600,000,000.0 | 600,000,000.0 |  |  |
Tanger Factory Outlet Centers, Inc. [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Repayments of Other Long-term Debt |  | 25,924,000 | $ 873,000 |  |
Tanger Factory Outlet Centers, Inc. [Member] | Debt [Member] | Mortgages [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum amount of unconsolidated joint venture debt guaranteed by the Company | 21,900,000 | 21,900,000 |  |  |
Tanger Factory Outlet Centers, Inc. [Member] | Debt [Member] | Line of Credit [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum amount of unconsolidated joint venture debt guaranteed by the Company | 0 | 0 |  |  | 0
Tanger Factory Outlet Centers, Inc. [Member] | Debt [Member] | Unsecured Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum amount of unconsolidated joint venture debt guaranteed by the Company | $ 325,000,000 | $ 325,000,000 |  |  | $ 350,000,000

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