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Acquisitions (Schedule of Allocation of purchase price consideration) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Jun. 30, 2018
Allocation of purchase price consideration:    
Goodwill $ 47,977 $ 37,061
SEI Technical Services [Member]    
Allocation of purchase price consideration:    
Accounts receivable 2,658  
Inventory 1,595  
Other assets 99  
Property, plant and equipment 376  
Intangible assets 3,100  
Accounts payable and accrued expenses (734)  
Customer deposits (398)  
Total identifiable net assets 6,696  
Goodwill 6,449  
Total $ 13,145