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REVENUE RECOGNITION, Adoption of ASC Topic 606 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Adoption of ASC Topic 606 [Abstract]      
Revenues $ 616,219 $ 499,099  
ASC Topic 606 [Member]      
Adoption of ASC Topic 606 [Abstract]      
Cumulative impact on opening retained earnings     $ 11,200
Impact of Adopting ASC Topic 606 [Member] | ASC Topic 606 [Member]      
Adoption of ASC Topic 606 [Abstract]      
Revenues $ (600)