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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended 14 Months Ended
Nov. 13, 2017
Nov. 30, 2017
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Goodwill     $ 43,832 $ 43,832 $ 43,620 $ 19,995
Well Service Group, Inc. and Utility Access Solutions, Inc. (WSG) [Member]            
Business Acquisition [Line Items]            
Receivables     14,527 14,527    
Inventories     3,207 3,207    
Other current assets     114 114    
Property, plant and equipment     16,002 16,002    
Intangible assets     26,970 26,970    
Total assets acquired     60,820 60,820    
Current liabilities     7,133 7,133    
Total liabilities assumed     7,133 7,133    
Net assets purchased     53,687 53,687    
Goodwill     23,750 23,750    
Total purchase consideration     77,437 77,437    
Cash conveyed at closing in 2017 $ 44,750 $ 45,000        
Equity issued at closing in 2017 $ 32,438          
Cash conveyed at working capital settlement in 2018     $ 249      
Total purchase consideration       $ 77,437