DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Notional Amount and Fair Value (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Foreign currency exchange contracts | Maximum
Derivative Instruments and Hedging Activities
Term of derivative instrument	1 month
Not designated as hedging instruments | Receive CAD/pay USD | Accounts receivable, net
Derivative Instruments and Hedging Activities
Notional amount, Assets		$ 4,892
Fair Value, Assets		61
Not designated as hedging instruments | Receive SGD/pay USD | Accounts receivable, net
Derivative Instruments and Hedging Activities
Notional amount, Assets	$ 5,279	223
Fair Value, Assets	7	2
Not designated as hedging instruments | Receive NOK/pay USD | Accounts receivable, net
Derivative Instruments and Hedging Activities
Notional amount, Assets	918	1,534
Fair Value, Assets	2	18
Not designated as hedging instruments | Receive USD/pay BRL | Accounts receivable, net
Derivative Instruments and Hedging Activities
Notional amount, Assets		1,806
Fair Value, Assets		1
Not designated as hedging instruments | Receive USD/pay BRL | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	3,567
Fair Value, Liabilities	(30)
Not designated as hedging instruments | Receive USD/pay CLP | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities		1,112
Fair Value, Liabilities		(8)
Not designated as hedging instruments | Receive USD/pay COP | Accounts receivable, net
Derivative Instruments and Hedging Activities
Notional amount, Assets		2,803
Fair Value, Assets		13
Not designated as hedging instruments | Receive USD/pay GBP | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	37,904	31,342
Fair Value, Liabilities	(129)	(334)
Not designated as hedging instruments | Receive USD/pay EUR | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	50,572	65,131
Fair Value, Liabilities	(408)	(642)
Not designated as hedging instruments | Receive USD/pay AUD | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	14,118	17,238
Fair Value, Liabilities	(82)	(177)
Not designated as hedging instruments | Receive USD/pay ZAR | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	16,633	21,311
Fair Value, Liabilities	(192)	(222)
Not designated as hedging instruments | Receive USD/pay MXN | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	3,035	7,720
Fair Value, Liabilities	(54)	(126)
Not designated as hedging instruments | Receive USD/pay NZD | Accounts receivable, net
Derivative Instruments and Hedging Activities
Notional amount, Assets	2,719
Fair Value, Assets	12
Not designated as hedging instruments | Receive USD/pay NZD | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities		1,826
Fair Value, Liabilities		(18)
Not designated as hedging instruments | Receive USD/pay TRY | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	5,277	5,483
Fair Value, Liabilities	(92)	$ (52)
Not designated as hedging instruments | Receive USD/pay RUB | Accrued liabilities
Derivative Instruments and Hedging Activities
Notional amount, Liabilities	2,774
Fair Value, Liabilities	$ (30)