Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Schedule of Company's Financial Assets and (Liabilities) at Fair Value on Recurring Basis

The following table summarizes the basis used to measure the Company’s financial assets (liabilities) at fair value on a recurring basis in the balance sheets at December 31, 2017 and 2016:

	Basis of Fair Value Measurements
	Balance at December 31, 2017		Level 1		Level 2		Level 3
	(In thousands)
Available for sale securities	$	6,742	$	6,742	$	—	$	—
Foreign currency exchange contracts	5,779		—		5,779		—

	Basis of Fair Value Measurements
	Balance at December 31, 2016		Level 1		Level 2		Level 3
	(In thousands)
Available for sale securities	$	5,369	$	5,369	$	—	$	—