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Other Assets Goodwill (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Goodwill [Line Items] |  |  |  |
Goodwill | $ 318,710 |  | $ 331,884 | $ 0
Goodwill, Other Increase (Decrease) | (2,525) |  | 0 |
Goodwill, Impairment Loss | (9,220) |  | 0 |
Goodwill, Written off Related to Sale of Business Unit | 1,929 |  | 0 |
Impairment of Real Estate | 29,443 | $ 0 |  |
Equity One Inc. [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Goodwill, Purchase Accounting Adjustments | $ 500 |  |  |
Goodwill, Acquired During Period |  |  | $ 331,884 |

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