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Tealstone Acquisition - Consideration Transfered and Purchase Price Allocation (Details) - USD ($)
$ in Thousands
 9 Months Ended
Apr. 03, 2017
Sep. 30, 2017
Sep. 30, 2016
Business Combination, Consideration Transferred [Abstract]      
Common stock (1,882,058 shares)   $ 17,061 $ 0
Business acquisition, number of shares issued 1,882,058    
Tealstone      
Business Combination, Consideration Transferred [Abstract]      
Cash $ 55,000    
Common stock (1,882,058 shares) 17,061    
Promissory notes 4,436    
Deferred payments 7,153    
Total $ 83,650    
Business acquisition, number of shares issued 1,882,058    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]      
Cash $ 139    
Accounts receivable 19,876    
Costs and estimated earnings in excess of billings on uncompleted contracts 2,944    
Inventory 1,218    
Other current assets 54    
Property, plant and equipment 565    
Other assets, net 1    
Identifiable intangible assets and Goodwill 77,028    
Accounts payable (16,781)    
Billings in excess of costs and estimated earnings on uncompleted contracts (303)    
Accrued expenses (823)    
State income tax payable (268)    
Total Consideration $ 83,650