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ACQUISITIONS Purchase Price Allocation (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Apr. 02, 2018
Dec. 31, 2017
Assets:      
Goodwill $ 480,351   $ 395,504
MXD Group      
Assets:      
Operating property and equipment   $ 11,903  
Goodwill   70,529  
Customer relationships and other intangibles   37,551  
Other assets, primarily accounts receivable   32,492  
Total assets   152,475  
Liabilities [Abstract]      
Accrued liabilities   (18,108)  
Deferred income taxes   (9,610)  
Other liabilities, primarily accounts payable   (5,053)  
Net assets acquired   $ 119,704