Pension and Severance Plans (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Components of net periodic pension cost

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

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
	(In thousands)
Service cost	$	9,024		$	4,177		$	25,684		$	6,605
Interest cost	925			725			2,753			2,251
Expected return on plan assets	(961		)	(817		)	(2,864		)	(2,523		)
Amortization of prior service cost	9			8			26			25
Recognized actuarial loss	24			23			71			69
Net periodic pension cost	$	9,021		$	4,116		$	25,670		$	6,427

Defined Contribution Plan Disclosures [Table Text Block]

The following table summarizes our defined contribution expense:

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2016		2015		2016		2015
	(In thousands)
Defined contribution expense	$	1,939	$	1,810	$	7,106	$	6,934