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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