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OTHER NON-CURRENT LIABILITIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other Liabilities, Noncurrent [Abstract]      
Acquisition related obligations $ 0 $ 8,422  
Other non-current liabilities 10,480 9,731  
Total 10,480 18,153  
Gain Contingencies [Line Items]      
Change in the fair value of Equator Earn Out 0 (7,591) $ (37,924)
Change in the fair value of acquisition related contingent consideration $ (3,555) (7,184) $ (37,924)
Equator LLC      
Gain Contingencies [Line Items]      
Value of Equator contingent consideration after payment to sellers   $ 0