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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands | Nov. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill |  | $ 275,487 | $ 275,487
Houston [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Deferred payments | $ 2,000 |  |

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