Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effects of Derivative Instruments on the Income Statement (Details)

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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effects of Derivative Instruments on the Income Statement (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain or (loss) recognized in income $ (150) $ 266 $ (297) $ 236
Sell AUD/Buy USD Fwd Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain or (loss) recognized in income     (38) 23
Sell AUD/Buy USD Fwd Contract | Other inc/(exp)        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain or (loss) recognized in income (27) 15    
Sell CAD/Buy USD Fwd Contract        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain or (loss) recognized in income     $ (259) 213
Sell CAD/Buy USD Fwd Contract | Other inc/(exp)        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain or (loss) recognized in income $ (123) $ 251    
Maximum        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain or (loss) recognized in income       $ 200