Fair Value (Tables)

3 Months Ended

Mar. 31, 2019

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, 2019
	Level 1		Level 2		Level 3		Total
Financial assets (liabilities):
Cash equivalents and current investments	$	32,326	$	—	$	—	$	32,326
Other long-term assets		3,496		—		—		3,496
Life insurance contracts		—		—		38,516		38,516
Total	$	35,822	$	—	$	38,516	$	74,338

	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
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):

Beginning balance at January 1, 2019	$	35,590
Actual return on plan assets		2,441
Purchase and issuances		2,003
Sales and settlements		(1,518	)
Transfers into Level 3		—
Ending balance at March 31, 2019	$	38,516