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Acquisition (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Oct. 28, 2016
Business Acquisition [Line Items]      
Goodwill $ 46,981 $ 46,781  
Western Pacific Enterprises [Member]      
Business Acquisition [Line Items]      
Total consideration, net of net asset adjustments 11,283    
Accounts receivable, net 20,249    
Costs and estimated earnings in excess of billings on uncompleted contracts 1,610    
Other current assets 8    
Property and equipment 4,154    
Intangible assets 501    
Accounts payable (10,125)    
Billings in excess of costs and estimated earnings on uncompleted contracts (3,020)    
Other current liabilities (2,294)    
Net identifiable assets 11,083    
Unallocated intangible assets 0    
Goodwill 200    
Scenario, Previously Reported [Member] | Western Pacific Enterprises [Member]      
Business Acquisition [Line Items]      
Total consideration, net of net asset adjustments     $ 11,283
Accounts receivable, net     20,249
Costs and estimated earnings in excess of billings on uncompleted contracts     1,610
Other current assets     8
Property and equipment     4,108
Intangible assets     0
Accounts payable     (10,125)
Billings in excess of costs and estimated earnings on uncompleted contracts     (3,020)
Other current liabilities     (2,294)
Net identifiable assets     10,536
Unallocated intangible assets     747
Goodwill     $ 0
Restatement Adjustment [Member] | Western Pacific Enterprises [Member]      
Business Acquisition [Line Items]      
Total consideration, net of net asset adjustments 0    
Accounts receivable, net 0    
Costs and estimated earnings in excess of billings on uncompleted contracts 0    
Other current assets 0    
Property and equipment 46    
Intangible assets 501    
Accounts payable 0    
Billings in excess of costs and estimated earnings on uncompleted contracts 0    
Other current liabilities 0    
Net identifiable assets 547    
Unallocated intangible assets (747)    
Goodwill $ 200