Pension Plans (Tables)

3 Months Ended

Mar. 31, 2017

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 March 31,
	2017			2016
	(In thousands)
Service cost	$	8,340		$	8,170
Interest cost	1,007			904
Expected return on plan assets	(1,128		)	(947		)
Amortization of prior service cost	31			9
Recognized actuarial loss	22			24
Net periodic pension cost	$	8,272		$	8,160

Defined contribution plan disclosures

The following table summarizes our defined contribution expense:

	For the Three Months Ended March 31,
	2017		2016
	(In thousands)
Defined contribution expense	$	3,198	$	2,935