DERIVATIVE INSTRUMENTS (Notional Amount of Hedging Instruments) (Details) - Sep. 30, 2018 - Designated as Hedging Instrument - Cash Flow Hedging ₱ in Thousands, $ in Thousands, $ in Thousands	USD ($)	PHP (₱)	CAD ($)
Forward Contracts
Derivative [Line Items]
Derivative, Notional Amount	$ 28,901
Canadian Foreign Exchange Contract
Derivative [Line Items]
Derivative, Notional Amount	3,986		$ 5,100
Philippine Foreign Exchange Contract
Derivative [Line Items]
Derivative, Notional Amount	$ 24,915	₱ 1,342,000