Fair Value (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value [Abstract]

Assets Measured at Fair Value on a Recurring Basis

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

	Fair Value at December 31, 2019
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash equivalents and current investments	$	54,642	$	—	$	—	$	54,642
Other long-term assets		3,216		—		—		3,216
Life insurance contracts		—		—		41,707		41,707
Total	$	57,858	$	—	$	41,707	$	99,565

	Fair Value at December 31, 2018
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash equivalents and current investments	$	35,260	$	—	$	—	$	35,260
Other long-term assets		3,568		—		—		3,568
Life insurance contracts		—		—		35,590		35,590
Total	$	38,828	$	—	$	35,590	$	74,418

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	2019			2018
Beginning balance at January 1	$	35,590		$	37,737
Actual return on plan assets		5,688			(1,788	)
Purchases and issuances		2,003			—
Sales and settlements		(1,574	)		(359	)
Transfers into Level 3		—			—
Ending balance at December 31	$	41,707		$	35,590