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Investments in Unconsolidated Real Estate Joint Ventures (Summary Statements of Operations for Unconsolidated Joint Ventures) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Unconsolidated Properties [Member] |  |  |  |
Summary Statements of Operations of Unconsolidated Joint Ventures [Line Items] |  |  |  |
Revenues | $ 23,538 | $ 25,241 | $ 70,940 | $ 72,588
Expenses: |  |  |  |
Property operating | 9,147 | 8,987 | 28,032 | 27,242
General and administrative | 49 | 72 | 301 | 289
Asset impairment | 0 | 18,042 | 0 | 18,042
Depreciation and amortization | 6,860 | 6,998 | 19,768 | 21,453
Total expenses | 16,056 | 34,099 | 48,101 | 67,026
Operating income (loss) | 7,482 | (8,858) | 22,839 | 5,562
Interest expense | (3,810) | (2,776) | (10,275) | (7,497)
Other non-operating income (expense) | 68 | 20 | 175 | 23
Net income (loss) | 3,740 | (11,614) | 12,739 | (1,912)
Tanger Factory Outlet Centers, Inc. [Member] |  |  |  |
Summary Statements of Operations of Unconsolidated Joint Ventures [Line Items] |  |  |  |
Revenues | 124,236 | 120,765 | 367,482 | 361,747
Expenses: |  |  |  |
Property operating | 39,653 | 37,571 | 119,817 | 115,074
General and administrative | 10,752 | 10,934 | 32,861 | 33,846
Asset impairment | 49,739 | 0 | 49,739 | 0
Depreciation and amortization | 32,850 | 30,976 | 98,667 | 95,175
Total expenses | 132,994 | 79,382 | 301,084 | 244,623
Operating income (loss) | (8,758) | 41,383 | 66,398 | 117,124
Interest expense | (16,367) | (16,489) | (48,348) | (49,496)
Other non-operating income (expense) | 261 | 591 | 661 | 683
Net income (loss) | (23,031) | (16,034) | 24,944 | 38,427
The Company and Operating Partnership's share of: |  |  |  |
Net income (loss) | 1,833 | (5,893) | 6,233 | (1,201)
Depreciation and amortization and asset impairments (real estate related) | $ 3,466 | $ 12,604 | $ 10,020 | $ 19,992

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