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Business Combinations - Assets Acquired and Liabilities Assumed (Details) - USD ($)
$ in Thousands
8 Months Ended 9 Months Ended
Jun. 30, 2018
Nov. 13, 2017
Jun. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Business Acquisition [Line Items]            
Receivables       $ 264,014 $ 257,425 $ 265,866
Inventories       202,707 $ 170,819 165,336
Property, plant and equipment       313,989   315,320
Total assets       928,321   902,716
Current liabilities       144,966   158,414
Total liabilities       368,170   355,236
Goodwill       44,015   $ 43,620
Well Service Group, Inc. and Utility Access Solutions, Inc. (WSG)            
Business Acquisition [Line Items]            
Receivables       14,527    
Inventories       3,207    
Other current assets       114    
Property, plant and equipment       16,002    
Intangible assets       26,970    
Total assets       60,820    
Current liabilities       7,133    
Total liabilities       7,133    
Net assets purchased       53,687    
Goodwill       23,750    
Total purchase consideration       77,437    
Cash conveyed at closing in 2017   $ 44,750 $ 45,000 $ 249    
Equity issued at closing in 2017   32,438        
Total purchase consideration $ 77,437 $ 77,400