Goodwill (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

Changes in the carrying amount of goodwill are as follows:

	Goodwill
	(In thousands)
Balance at December 31, 2015	$	23,409
Translation adjustment	713
Balance at December 31, 2016	$	24,122
Translation adjustment	914
Balance at December 31, 2017	$	25,036