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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Nov. 13, 2017
Mar. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 44,397 $ 43,620
Well Service Group, Inc. and Utility Access Solutions, Inc. (WSG)      
Business Acquisition [Line Items]      
Receivables $ 14,565    
Inventories 3,207    
Other current assets 114    
Property, plant and equipment 15,718    
Intangible assets 26,970    
Total assets acquired 60,574    
Current liabilities 7,283    
Total liabilities assumed 7,283    
Net assets purchased 53,291    
Goodwill 23,864    
Total purchase consideration 77,155    
Cash conveyed at closing 44,750    
Equity issued at closing 32,438    
Due from seller (33)    
Total purchase consideration $ 77,155