Hedge Contracts Hedge Contracts (Tables)

12 Months Ended

Dec. 31, 2017

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions Table

	December 31, 2017
	US Dollar Notional Amount		Traded Exchange Rate	Settlement Date
	(In Thousands)
Forward sale Mexican peso	$	6,067	19.28	1/18/2018

Derivative Designated as Hedging Instruments Table

	Balance Sheet	Fair Value at			Fair Value at
Foreign currency derivative instruments	Location	December 31, 2017			December 31, 2016
		(In Thousands)
Forward sale contracts	Current assets	$	130		57
Forward sale contracts	Current liabilities	(10		)	—
Total		$	120		57