Fair value measurements (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Recorded at Fair Value on Recurring Basis

The fair value of the Company’s financial assets and liabilities on a recurring basis were as follows:

(U.S. Dollars in thousands)	Balance March 31, 2014			Level 1			Level 2			Level 3
Assets
Deferred compensation plan
Money market funds	$	281		$	281		$	—		$	—
Bonds		89			89			—			—
Treasury securities		661			661			—			—
Mutual funds		1,282			1,282			—			—
Total	$	2,313		$	2,313		$	—		$	—
Liabilities
Deferred compensation plan	$	(1,970	)	$	(1,970	)	$	—		$	—
Cash Flow Hedges
Cross-currency hedge		(1,035	)		—			(1,035	)		—
Total	$	(3,005	)	$	(1,970	)	$	(1,035	)	$	—

(U.S. Dollars in thousands)	Balance December 31, 2013			Level 1			Level 2			Level 3
Assets
Deferred compensation plan
Money market funds	$	451		$	451		$	—		$	—
Bonds		51			51			—			—
Treasury securities		660			660			—			—
Mutual funds		1,165			1,165			—			—
Total	$	2,327		$	2,327		$	—		$	—
Liabilities
Deferred compensation plan	$	(2,506	)	$	(2,506	)	$	—		$	—
Cash Flow Hedges
Cross-currency hedge		(1,036	)		—			(1,036	)		—
Total	$	(3,542	)	$	(2,506	)	$	(1,036	)	$	—