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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
Nov. 13, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]        
Goodwill   $ 43,620 $ 19,995 $ 19,009
Well Service Group, Inc. and Utility Access Solutions, Inc. (WSG) [Member]        
Business Acquisition [Line Items]        
Receivables $ 14,854      
Inventories 3,207      
Other current assets 114      
Property, plant and equipment 16,313      
Intangible assets 27,050      
Total Assets Acquired 61,538      
Current Liabilities 6,833      
Total Liabilities Assumed 6,833      
Net Assets Purchased 54,705      
Goodwill 23,188      
Total Purchase Consideration 77,894      
Cash conveyed at closing 44,750      
Equity issued at closing 32,438      
Due to seller 706      
Total Purchase Consideration $ 77,894