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Tealstone Acquisition - Consideration Transfered and Purchase Price Allocation (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 03, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Combination, Consideration Transferred [Abstract]        
Common stock (1,882,058 shares)   $ 17,061 $ 0 $ 0
Shares issued in acquisition of business (in shares)   1,882,058    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
Goodwill   $ 85,231 $ 54,820  
Tealstone        
Business Combination, Consideration Transferred [Abstract]        
Cash, net of cash acquired $ 54,861      
Common stock (1,882,058 shares) 17,061      
Promissory notes 4,436      
Deferred payments 7,153      
Total $ 83,511      
Shares issued in acquisition of business (in shares) 1,882,058      
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]        
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 46,617      
Goodwill 30,411      
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 $ 83,511