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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financial instruments    
Cash and cash equivalents $ 39,478 $ 44,958
Restricted cash 3,712 2,717
Foreign currency forward contracts, liabilities 277 465
Recurring | Level 1    
Financial instruments    
Cash and cash equivalents 39,478 44,958
Cash and cash equivalents, fair value 39,478 44,958
Restricted cash 3,712 2,717
Restricted cash, fair value 3,712 2,717
Recurring | Level 2    
Financial instruments    
Foreign currency forward contracts, assets 658 583
Foreign currency forward contracts, liabilities $ 935 $ 1,048