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Debt of the Operating Partnership (Tables) - Tanger Properties Limited Partnership [Member] | 3 Months Ended
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Mar. 31, 2021
Schedule of Debt | The debt of the Operating Partnership consisted of the following (in thousands):
|  |  |  |  |  |  |  | As of |  | As of
|  |  |  |  |  |  |  | March 31, 2021 |  | December 31, 2020
|  | Stated Interest Rate(s) |  | Maturity Date |  | Principal |  | Book Value(1) |  | Principal |  | Book Value(1)
Senior, unsecured notes: |  |  |  |  |  |  |  |  |  |  |  |
Senior notes |  | 3.875 | % |  |  |  | December 2023 |  | $ | 250,000 |  |  | $ | 248,136 |  |  | $ | 250,000 |  |  | $ | 247,967 |
Senior notes |  | 3.750 | % |  |  |  | December 2024 |  | 250,000 |  |  | 248,585 |  |  | 250,000 |  |  | 248,493 |
Senior notes |  | 3.125 | % |  |  |  | September 2026 |  | 350,000 |  |  | 346,909 |  |  | 350,000 |  |  | 346,770 |
Senior notes |  | 3.875 | % |  |  |  | July 2027 |  | 300,000 |  |  | 297,444 |  |  | 300,000 |  |  | 297,346 |
Mortgages payable: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Atlantic City (2)(3) |  | 5.14 | % | - | 7.65% |  | November 2021- December 2026 |  | 26,420 |  |  | 27,547 |  |  | 27,343 |  |  | 28,569 |
Southaven (4) |  | LIBOR | + | 1.80% |  | April 2021 |  | 51,400 |  |  | 51,386 |  |  | 51,400 |  |  | 51,371 |
Unsecured term loan |  | LIBOR(5) | + | 1.00% |  | April 2024 |  | 325,000 |  |  | 322,753 |  |  | 350,000 |  |  | 347,370 |
Unsecured lines of credit |  | LIBOR(5) | + | 1.00% |  | October 2021 (6) |  | — |  |  | — |  |  | — |  |  | — |
|  |  |  |  |  |  |  | $ | 1,552,820 |  |  | $ | 1,542,760 |  |  | $ | 1,578,743 |  |  | $ | 1,567,886 |
(1)Including premiums and net of debt discount and debt origination costs. (2)The effective interest rate assigned during the purchase price allocation to the Atlantic City mortgages assumed during the acquisition in 2011 was 5.05%. (3)Principal and interest due monthly with remaining principal due at maturity. (4)In April 2021 we extended the maturity date 90 days to explore other financing options however, we may extend the loan using our two-year extension option to April 2023, which could require reductions in principal or additional guarantees to comply with extension requirements. (5)Beginning in June 2020, if LIBOR is less than 0.25% per annum, the rate will be deemed to be 0.25% for the portions of the lines of credit and bank term loan that are not fixed with an interest rate swap. (6)Unsecured lines of credit have a one-year extension option to extend maturity to October 2022.
Schedule of Maturities of Long-term Debt | Maturities of the existing long-term debt as of March 31, 2021 for the next five years and thereafter are as follows (in thousands):
Calendar Year |  | Amount
For the remainder of 2021 |  | $ | 56,270 |
2022 |  | 4,436 |
2023 |  | 254,768 |
2024 |  | 580,140 |
2025 |  | 1,501 |
Thereafter |  | 655,705 |
Subtotal |  | 1,552,820 |
Net discount and debt origination costs |  | (10,060) |
Total |  | $ | 1,542,760 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of maturity and sinking fund requirement for long-term debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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