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Other Assets Other Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Other Current Assets [Line Items] |  |  |
Goodwill | $ 318,710 | $ 331,884 | $ 0
Investments | 44,014 | 41,636 |
Other Prepaid Expense, Current | 24,093 | 30,332 |
Derivative Asset | 26,802 | 14,515 |
Furniture and Fixtures, Gross | 6,715 | 6,123 |
Deferred Costs and Other Assets | 7,392 | 2,637 |
Parent Company [Member] |  |  |
Other Current Assets [Line Items] |  |  |
Other Assets | $ 427,726 | $ 427,127 |

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- Definition Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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