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GOODWILL AND OTHER INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Goodwill [Roll Forward]    
Balance at beginning of period $ 197,362  
Purchase price adjustment (151)  
Translation adjustment 0  
Balance at end of period 197,211  
Other Intangibles Assets [Roll Forward]    
Balance at beginning of period 112,297  
Purchase price adjustment 0  
Translation adjustment 1,182  
Amortization (9,038) $ (10,667)
Balance at end of period 104,441  
Total Goodwill and Intangible Assets [Roll Forward]    
Balance at beginning of period 309,659  
Purchase price adjustment (151)  
Translation adjustment 1,182  
Amortization (9,038) $ (10,667)
Balance at end of period 301,652  
Service Centers [Member]    
Goodwill [Roll Forward]    
Balance at beginning of period 164,244  
Balance at end of period 164,093  
Innovative Pumping Solutions [Member]    
Goodwill [Roll Forward]    
Balance at beginning of period 15,980  
Balance at end of period 15,980  
Supply Chain Services [Member]    
Goodwill [Roll Forward]    
Balance at beginning of period 17,138  
Balance at end of period $ 17,138