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Acquisition (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Jul. 02, 2018
Dec. 31, 2017
Goodwill $ 71,099   $ 46,994
Huen Electric Inc [Member]      
Consideration paid   $ 47,082  
Preliminary estimated net asset adjustments   10,749  
Total consideration, net of net asset adjustments   57,831  
Accounts receivable, net   33,903  
Costs and estimated earnings in excess of billings on uncompleted contracts   10,570  
Other current and long term assets   88  
Property and equipment   3,188  
Accounts payable   (9,592)  
Billings in excess of costs and estimated earnings on uncompleted contracts   (6,394)  
Other current liabilities   (6,571)  
Net identifiable assets and liabilities   25,192  
Unallocated intangible assets   9,800  
Total acquired assets and liabilities   34,992  
Fair value of acquired noncontrolling interests   (1,272)  
Goodwill   $ 24,111