Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements Debt (Details)

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Fair Value Measurements Debt (Details) - Tanger Properties Limited Partnership [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 1,603,814 $ 1,668,475
Recorded value of debt 1,569,773 1,712,918
Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 0 0
Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt 1,169,481 1,085,138
Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Fair value of debt $ 434,333 $ 583,337