Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2018

Retirement Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

The components of net period benefit cost for the three months ended March 31, 2018 and 2017 are as follows:

	Three Months Ended March 31, 2018
	Retirement Income Plan			National Service-Related Pension Plan			Other Post-Retirement Benefits		Superannuation			Total
Components of net periodic benefit cost:	(In thousands)
Service cost	$	8		$	19		$	—	$	58		$	85
Interest cost	354			300			5		27			686
Expected return on plan assets	(512		)	(342		)	—		(45		)	(899		)
Amortization of net loss	311			179			—		—			490
Amortization of prior service cost	—			—			—		8			8
Net pension benefit cost	$	161		$	156		$	5	$	48		$	370

	Three Months Ended March 31, 2017
	Retirement Income Plan			National Service-Related Pension Plan			Other Post-Retirement Benefits		Superannuation			Total
Components of net periodic benefit cost:	(In thousands)
Service cost	$	16		$	126		$	—	$	58		$	200
Interest cost	396			314			6		30			746
Expected return on plan assets	(439		)	(294		)	—		(43		)	(776		)
Amortization of net loss	472			204			—		—			676
Amortization of prior service cost	—			53			—		—			53
Effect of settlement	173			59			—		—			232
Net pension benefit cost	$	618		$	462		$	6	$	45		$	1,131