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Debt of the Operating Partnership (Tables) - Tanger Properties Limited Partnership [Member] | 12 Months Ended
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Dec. 31, 2018
Schedule of Debt | The debt of the Operating Partnership as of December 31, 2018 and 2017 consisted of the following (in thousands):
|  |  |  |  |  | 2018 |  | 2017
|  | 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 |  |  | 246,664 |  |  | 250,000 |  |  | 246,036 |
Senior notes |  | 3.750 | % |  | December 2024 |  | 250,000 |  |  | 247,765 |  |  | 250,000 |  |  | 247,410 |
Senior notes |  | 3.125 | % |  | September 2026 |  | 350,000 |  |  | 345,669 |  |  | 350,000 |  |  | 345,128 |
Senior notes |  | 3.875 | % |  | July 2027 |  | 300,000 |  |  | 296,565 |  |  | 300,000 |  |  | 296,182 |
Mortgages payable: |  |  |  |  |  |  |  |  |  |  |  |
Atlantic City (2) (3) |  | 5.14%-7.65% |  |  | November 2021- December 2026 |  | 34,279 |  |  | 36,298 |  |  | 37,462 |  |  | 39,879 |
Southaven |  | LIBOR + 1.80% |  |  | April 2021 |  | 51,400 |  |  | 51,173 |  |  | 60,000 |  |  | 59,881 |
Unsecured term loan |  | LIBOR + 0.90% |  |  | April 2024 |  | 350,000 |  |  | 346,799 |  |  | 325,000 |  |  | 322,975 |
Unsecured lines of credit |  | LIBOR + 0.875% |  |  | October 2021 |  | 145,100 |  |  | 141,985 |  |  | 208,100 |  |  | 206,160 |
|  |  |  |  |  | $ | 1,730,779 |  |  | $ | 1,712,918 |  |  | $ | 1,780,562 |  |  | $ | 1,763,651 |
(1) | Includes premiums and net of debt discount and unamortized debt origination costs. Unamortized debt origination costs were $14.1 million and $12.7 million as of December 31, 2018 and 2017, respectively. Amortization of deferred debt origination costs included in interest expense for the years ended December 31, 2018, 2017 and 2016 was $3.1 million, $3.3 million and $3.2 million, respectively.
(2) | The effective interest rate assigned during the purchase price allocation to this assumed mortgage during the acquisition in 2011 was 5.05%.
(3) | Principal and interest due monthly with remaining principal due at maturity.
Schedule of Maturities of Long-term Debt | Maturities of the existing long-term debt as of December 31, 2018 for the next five years and thereafter are as follows (in thousands):
Calendar Year |  | Amount |
2019 |  | $ | 3,370 |
2020 |  | 3,566 |
2021 |  | 202,293 |
2022 |  | 4,436 |
2023 |  | 254,768 |
Thereafter |  | 1,262,346 |
Subtotal |  | 1,730,779 |
Net discount and debt origination costs |  | (17,861 | )
Total |  | $ | 1,712,918 |

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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 the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + 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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