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ACQUISITIONS (Details) - USD ($)
$ in Thousands
1 Months Ended
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Assets      
Goodwill $ 358,865 $ 310,240 $ 329,741
Bapco      
Acquisitions      
Percentage of interest acquired 20.00%    
Payment to acquire business $ 5,200