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Acquisitions - Summary of acquisition by acquisition (Details) - Huen Electric Inc [Member] - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jul. 02, 2018
Dec. 31, 2018
Dec. 31, 2018
Consideration paid $ 47,082 $ 47,082 $ 11,200
Preliminary estimated net asset adjustments 10,749 11,210  
Total consideration, net of net asset adjustments 57,831 58,292  
Accounts receivable 33,903 34,109  
Contract assets 10,570 11,580  
Other current and long term assets 88 89  
Property and equipment 3,188 3,188  
Intangible assets 0 24,300  
Accounts payable (9,592) (10,866)  
Contract liabilities (6,394) (5,869)  
Other current liabilities (6,570) (6,570)  
Net identifiable assets and liabilites 25,193 49,961  
Unallocated intangible assets 9,800 0  
Total aquired assets and liabilites 34,993 49,961  
Fair value of aquired noncontrolling interests (1,273) (1,280)  
Goodwill $ 24,111 9,611  
Consideration paid   0  
Preliminary estimated net asset adjustments   461  
Total consideration, net of net asset adjustments   461  
Accounts receivable   206  
Contract assets   1,010  
Other current and long term assets   1  
Property and equipment   0  
Intangible assets   24,300  
Accounts payable   (1,274)  
Contract liabilities   525  
Other current liabilities   0  
Net identifiable assets and liabilites   24,768  
Unallocated intangible assets   (9,800)  
Total aquired assets and liabilites   14,968  
Fair value of aquired noncontrolling interests   (7)  
Goodwill   $ (14,500)