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Acquisitions (Allocation of Purchase Price) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 23, 2015
Mar. 13, 2015
Jan. 13, 2015
Business Acquisition            
Goodwill $ 19,785 $ 18,932 $ 81,752      
TEW Plus LTD            
Business Acquisition            
Current assets       $ 4,420    
Other assets       0    
Property, plant, and equipment       47    
Goodwill       822    
Other intangibles       1,074    
Liabilities assumed       (3,597)    
Total       $ 2,766    
Inspection Oilfield Services (IOS)            
Business Acquisition            
Current assets         $ 19,877  
Other assets         708  
Property, plant, and equipment         51,453  
Goodwill         69,908  
Other intangibles         50,354  
Liabilities assumed         (23,596)  
Total         $ 168,704  
TEW Holdings, LTD            
Business Acquisition            
Current assets           $ 12,125
Other assets           0
Property, plant, and equipment           2,398
Goodwill           8,772
Other intangibles           14,048
Liabilities assumed           (6,465)
Total           $ 30,878