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INCOME TAXES - Changes in Valuation Allowance (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Deferred Tax Asset, Valuation Allowance [Roll Forward]    
Balance at beginning of period $ 62,333 $ 56,876
Balance at end of period 72,705 62,333
Valuation allowance increases primarily related to foreign NOLs [Member]    
Deferred Tax Asset, Valuation Allowance [Roll Forward]    
Valuation allowance, increase (decrease) 12,174 7,045
Valuation allowance releases related to foreign NOLs [Member]    
Deferred Tax Asset, Valuation Allowance [Roll Forward]    
Valuation allowance, increase (decrease) 3,870 437
Other valuation allowance changes, net [Member]    
Deferred Tax Asset, Valuation Allowance [Roll Forward]    
Valuation allowance, increase (decrease) $ 2,068 $ (1,151)