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ACQUISITIONS Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Apr. 02, 2018
Dec. 31, 2017
Assets:      
Goodwill $ 493,169   $ 395,504
MXD Group      
Assets:      
Operating property and equipment   $ 9,803  
Goodwill   81,848  
Customer relationships and other intangibles   23,651  
Other assets, primarily accounts receivable   31,492  
Total assets   146,794  
Liabilities [Abstract]      
Accrued liabilities   (18,107)  
Deferred income taxes   (5,760)  
Other liabilities, primarily accounts payable   (4,979)  
Net assets acquired   $ 117,948