FAIR VALUE (Tables)

3 Months Ended

Mar. 31, 2018

FAIR VALUE [Abstract]

Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following tables present the fair value hierarchy for those assets and liabilities measured at fair value on a recurring basis (U.S. dollars in thousands):

	Fair Value at March 31, 2018
	Level 1		Level 2			Level 3		Total
Financial assets (liabilities):
Cash equivalents and current investments	$	34,519	$	—		$	—	$	34,519
Other long-term assets		3,746		—			—		3,746
Forward contracts		—		(68	)		—		(68	)
Life insurance contracts		—		—			38,929		38,929
Total	$	38,265	$	(68	)	$	38,929	$	77,126

	Fair Value at December 31, 2017
	Level 1		Level 2		Level 3		Total
Financial assets (liabilities):
Cash equivalents and current investments	$	36,531	$	—	$	—	$	36,531
Other long-term assets		3,726		—		—		3,726
Forward contracts		—		158		—		158
Life insurance contracts		—		—		37,737		37,737
Total	$	40,257	$	158	$	37,737	$	78,152

Changes in Fair Value of Level 3 Marketable Securities

The following table provides a summary of changes in fair value of the Company's Level 3 marketable securities (U.S. dollars in thousands):

Life Insurance Contracts
Beginning balance at January 1, 2018	$	37,737
Actual return on plan assets:
Relating to assets still held at the reporting date		1 260
Purchases and issuances		—
Sales and settlements		(68	)
Transfers into Level 3		—
Ending balance at March 31, 2018	$	38,929