Pension and Severance Plans (Tables)

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Components of net periodic pension cost

The components of net periodic pension cost for these defined benefit plans are as follows:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2015			2014			2015			2014
	(In thousands)
Service cost	$	1,209		$	1,449		$	2,428		$	2,873
Interest cost	760			794			1,526			1,573
Expected return on plan assets	(850		)	(781		)	(1,706		)	(1,547		)
Amortization of prior service cost	8			50			17			99
Recognized actuarial loss	25			16			46			108
Net periodic pension cost	$	1,152		$	1,528		$	2,311		$	3,106

Schedule of Korean severance obligation