Market Risks and Derivative Hedge Contracts Market Risks and Derivative Hedge Contracts (Tables)

6 Months Ended

Jun. 30, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions Table

Derivative Contracts	US Dollar Notional Amount		Traded Exchange Rate	Settlement Date
	(In Thousands)
Forward purchase Euro	$	464	1.16	7/19/2018
Forward sale pounds sterling	2,521		1.33	7/19/2018
Forward sale Canadian dollar	5,941		1.31	7/19/2018
Forward purchase Mexican peso	1,692		20.68	7/19/2018
Forward purchase Norwegian krone	985		8.12	7/19/2018
Forward sale Mexican peso	6,083		20.71	7/19/2018

Derivatives Designated as Hedging Instruments Table

Foreign currency derivative instruments	Balance Sheet Location	Fair Value at June 30, 2018			Fair Value at December 31, 2017
		(In Thousands)
Forward purchase contracts	Current assets	$	158		$	111
Forward sale contracts	Current assets	22			130
Forward sale contracts	Current liabilities	(241		)	(255		)
Forward purchase contracts	Current liabilities	—			(113		)
Net asset (liability)		$	(61	)	$	(127	)