DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Notional Amounts) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Designated as Hedging Instrument | Derivatives designated as cash flow hedges: | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	$ 60,750	$ 69,950
Designated as Hedging Instrument | Derivatives designated as cash flow hedges: | Foreign currency option contracts
Derivatives, Fair Value [Line Items]
Notional Amount	28,000	24,000
Designated as Hedging Instrument | Derivatives designated as cash flow hedges: | Interest rate swaps
Derivatives, Fair Value [Line Items]
Notional Amount	650,000	650,000
Derivatives not designated as hedging instruments: | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	0	9,396
Derivatives not designated as hedging instruments: | Carbon options
Derivatives, Fair Value [Line Items]
Notional Amount	$ 3,115	$ 2,517