Other Noncurrent Assets, Net (Tables)

3 Months Ended

Mar. 31, 2018

Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]

Summary of Other Noncurrent Assets

	December 31,		March 31,
	2017		2018
	(In thousands)
Restricted cash	$	1,255	$	1,256
Pension asset		2,593		2,844
Other		995		1,053
Total	$	4,843	$	5,153