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ACQUISITIONS Table 1 - Navigator Acquisition Preliminary Purchase Price Allocation (Details) - USD ($)
$ in Thousands
May 04, 2017
Jun. 30, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 1,094,661 $ 1,097,475
Navigator Acquisition [Member]      
Business Acquisition [Line Items]      
Accounts receivable $ 4,747    
Other current assets 2,359    
Property, plant and equipment, net 376,690    
Intangible assets 700,000    
Goodwill 398,024    
Other long-term assets, net 2,199    
Current liabilities (22,300)    
Purchase price allocation, net of cash acquired $ 1,461,719    
Intangible assets, weighted average useful life (years) 20 years