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GOODWILL AND INTANGIBLE ASSETS (DETAILS) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Goodwill [Roll Forward]      
Goodwill net balance, opening $ 47,148 $ 47,148  
Acquisition of Ternian, goodwill   0  
Impairment charges, goodwill   0  
Goodwill net balance, closing 47,148 47,148  
Goodwill, gross     $ 42,237
Accumulated foreign currency translation adjustment, goodwill     4,911
Goodwill, net 47,148 47,148 47,148
Intangible Assets with an Indefinite Life [Roll Forward]      
Intangible assets with an indefinite life net balance, opening 26,036 26,036  
Acquisition of Ternian, intangible assets with an indefinite life   0  
Impairment charges, intangible assets with an indefinite life   0  
Intangible assets with an indefinite life net balance, closing 26,036 26,036  
Intangible assets with an indefinite life, gross     26,036
Accumulated foreign currency translation adjustment, intangible assets with an indefinite life     0
Intangible assets with an indefinite life, net 26,036 26,036 26,036
Intangible Assets with a Finite Life [Roll Forward]      
Intangible assets with a finite life net balance, opening 13,674 15,776  
Amortization, intangible assets with a finite life (1,809) (2,493)  
Intangible assets with a finite life net balance, closing 11,865 13,674  
Intangible assets with a finite life, gross     29,166
Accumulated amortization, intangible assets with a finite life     (17,301)
Accumulated foreign currency translation adjustment, intangible assets with a finite life     0
Intangible assets with a finite life, net 13,674 15,776 11,865
Goodwill and Intangible Assets [Roll Forward]      
Goodwill and intangible assets net balance, opening 86,858 88,960  
Amortization, intangible assets with a finite life (1,809) (2,493)  
Goodwill and intangible assets net balance, closing 85,049 86,858  
Goodwill and intangible assets, gross     97,439
Accumulated amortization, intangible assets with a finite life     (17,301)
Accumulated foreign currency translation, goodwill and intangible assets     4,911
Goodwill and intangible assets, net $ 86,858 88,960 $ 85,049
Ternian [Member]      
Intangible Assets with a Finite Life [Roll Forward]      
Acquisition of Ternian, intangible assets with a finite life   13,330  
Goodwill and Intangible Assets [Roll Forward]      
Acquisition of Ternian, goodwill and intangible assets   13,330  
Australian Acquiree [Member]      
Intangible Assets with a Finite Life [Roll Forward]      
Impairment charges, intangible assets with a finite life   (12,939)  
Goodwill and Intangible Assets [Roll Forward]      
Impairment charges, goodwill and intangible assets   $ (12,939)