DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES (Notional Amounts) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Aug. 31, 2015
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	$ 55,100	$ 44,800
Designated as Hedging Instrument | Cash Flow Hedging | Foreign currency option contracts
Derivatives, Fair Value [Line Items]
Notional Amount	58,000	91,000
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivatives, Fair Value [Line Items]
Notional Amount	650,000	650,000	$ 100,000	$ 100,000	$ 170,000
Not Designated as Hedging Instrument | Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount	$ 18,020	$ 0