DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Outstanding Derivative Instruments (Details) $ in Thousands	Jun. 30, 2018 USD ($) derivative_instrument
Derivative [Line Items]
Number of Instruments \| derivative_instrument	16
Sell Notional	$ 0
Buy Notional	$ 6,201
Sell AUD/Buy USD Fwd Contract
Derivative [Line Items]
Number of Instruments \| derivative_instrument	6
Sell Notional	$ 750
Buy Notional	$ 564
Sell CAD/Buy USD Fwd Contract
Derivative [Line Items]
Number of Instruments \| derivative_instrument	10
Sell Notional	$ 7,250
Buy Notional	$ 5,637

The number of derivative instruments of a particular group held by the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959

Name:	us-gaap_DerivativeNumberOfInstrumentsHeld
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant