Derivative Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2018

Derivative Financial Instruments

Schedule of notional amount and fair value of derivatives

	December 31, 2017
	Fair Value		Maturity Dates	Notional Amount
	(in thousands)
Foreign currency exchange forwards	$	—	January 2018	$	622

Schedule of gains and (losses) and weighted average notional amount of derivatives

	Year ended December 31,
	2018			2017			2016
		Gains (losses)	Weighted average notional amount		Gains (losses)	Weighted average notional amount		Gains (losses)	Weighted average notional amount
	(in thousands)
Foreign currency exchange forwards	$	327	2,869	$	(6)	314	$	219	7,175