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Acquisitions (Narrative) (Details) - Houston Interests, LLC [Member] - USD ($) $ in Thousands |  | 6 Months Ended
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Dec. 12, 2016 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Business Acquisition, Effective Date of Acquisition | Dec. 12, 2016 |
Business Acquisition, Name of Acquired Entity | Houston Interests, LLC |
Business Combination, Consideration Transferred | $ 42,506 |
Working capital payment made in period not presented |  | $ 1,000

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