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Segment Reporting - Summary of Segment Information (Parenthetical) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Nov. 16, 2017
Segment Reporting Information [Line Items] |  |  |  |
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively | $ 9,302 | $ 23,371 | $ 39,449 |
Core Portfolio |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity method investment, ownership percentage | 75.22% | 61.11% |  | 22.22%
Core Portfolio | Town Center |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity method investment, ownership percentage | 75.22% |  |  |
Operating Segments | Core Portfolio |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively | $ 7,415 | $ 3,735 | 3,774 |
Operating Segments | Core Portfolio | Town Center |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Equity in earnings of unconsolidated affiliates inclusive of gain on disposition of properties of $0, $15,336 and $35,950, respectively | $ 5,800 | $ 1,900 | $ 900 |
Equity method investment, ownership percentage | 75.22% |  |  | 22.22%
Property related cost | $ 700 |  |  |

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