Derivative instruments and hedging activities (Tables)

3 Months Ended

Mar. 31, 2021

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of balance sheet classification and fair values of derivative instruments

		Fair Value						Notional Amount
			March 31,			December 31,			March 31,		December 31,
	Balance sheet location		2021			2020			2021		2020
		U.S. $ in thousands
Assets derivatives -Foreign exchange contracts, not designated as hedging instruments	Other current assets	$	41		$	56		$	10,981	$	36,882
Assets derivatives -Foreign exchange contracts, designated as cash flow hedge	Other current assets		754			793			50,316		10,417
Liability derivatives -Foreign exchange contracts, not designated as hedging instruments	Accrued expenses and other current liabilities		(252	)		(1,098	)		44,078		37,999
Liability derivatives -Foreign exchange contracts, designated as hedging instruments	Accrued expenses and other current liabilities		(140	)		(1,584	)		18,473		50,186
		$	403		$	(1,833	)	$	123,848	$	135,484