Fair Value (Tables)

12 Months Ended

Dec. 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 December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial assets (liabilities):
Cash equivalents and current investments	$	35,260	$	─	$	─	$	35,260
Other long-term assets		3,568		─		─		3,568
Forward contracts		─		─		─		─
Life insurance contracts		─		─		35,590		35,590
Total	$	38,828	$	─	$	35,590	$	74,418

	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	2018			2017
Beginning balance at January 1	$	37,737		$	32,287
Actual return on plan assets		(1,788	)		4,917
Purchases and issuances		─			895
Sales and settlements		(359	)		(362	)
Transfers into Level 3		─			─
Ending balance at December 31	$	35,590		$	37,737