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Acquisitions and Other Investments - Goodwill Allocated to Segments (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Oct. 15, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 1,228,422 |  | $ 1,008,097 | $ 989,685
Pinnacle |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 219,531 |  |
Pinnacle | Northeast segment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 56,400 |  |
Pinnacle | South segment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 48,300 |  |
Pinnacle | West segment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | 51,431 |  |
Pinnacle | Midwest segment |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 63,400 |  |

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