DERIVATIVE INSTRUMENTS (Notional Amount of Hedging Instruments) (Details) - Dec. 31, 2018 - Designated as Hedging Instrument - Cash Flow Hedging ₱ in Thousands, $ in Thousands, $ in Thousands	USD ($)	PHP (₱)	CAD ($)
Canadian Foreign Exchange Contract
Derivative [Line Items]
Derivative, notional amount	$ 1,951		$ 2,500
Philippine Foreign Exchange Contract
Derivative [Line Items]
Derivative, notional amount	20,996	₱ 1,134,000
Forward Contracts
Derivative [Line Items]
Derivative, notional amount	$ 22,948