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Acquisitions (Narrative) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 12, 2016 | Feb. 01, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Jun. 30, 2016
Houston Interests, LLC [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets | $ 20,803 |  |  |  |
Business Acquisition, Effective Date of Acquisition | Dec. 12, 2016 |  |  |  |
Business Acquisition, Name of Acquired Entity | Houston Interests, LLC |  |  |  |
Business Combination, Consideration Transferred | $ 39,798 |  |  |  |
Acquisition costs |  |  |  | $ 400 |
Revenue of Acquiree since Acquisition Date, Actual |  |  | $ 2,300 |  |
Earnings of Acquiree since Acquisition Date, Actual |  |  | (200) |  |
Baillie Tank Equipment, Ltd. [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Current assets |  | $ 5,574 |  |  |
Business Acquisition, Effective Date of Acquisition |  | Feb. 01, 2016 |  |  |
Business Acquisition, Name of Acquired Entity |  | Baillie Tank Equipment, Ltd. (“BTE”) |  |  |
Business Combination, Consideration Transferred |  | $ 13,049 |  |  |
Economic purchase price |  | $ 15,400 |  |  |
Acquisition costs |  |  |  |  | $ 800
Revenue of Acquiree since Acquisition Date, Actual |  |  | 1,800 | 2,800 |
Earnings of Acquiree since Acquisition Date, Actual |  |  | $ 700 | $ 300 |

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