Employee Retirement and Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Defined Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Components of Net Periodic Benefit Cost

The following table sets forth the components of net periodic benefit cost for our defined benefit plans during the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30						Six Months Ended June 30
	2018			2017			2018			2017
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	732		$	752		$	1,464		$	1,504
Interest cost	2,828			2,927			5,656			5,854
Expected return on plan assets	(4,411		)	(4,758		)	(8,822		)	(9,516		)
Amortizations:
Prior service cost	108			176			216			352
Unrecognized net loss	2,130			2,581			4,260			5,162
Net periodic benefit cost	$	1,387		$	1,678		$	2,774		$	3,356

Postretirement Benefits

Defined Benefit Plan Disclosure [Line Items]

Schedule of Components of Net Periodic Benefit Cost

The following table sets forth the components of net periodic benefit cost for our postretirement benefit plans during the three and six months ended June 30, 2018 and 2017:

	Three Months Ended June 30						Six Months Ended June 30
	2018			2017			2018			2017
	(In thousands)
Components of net periodic benefit cost:
Service cost	$	170		$	146		$	340		$	292
Interest cost	235			240			470			480
Amortizations:
Prior service cost	23			23			46			46
Unrecognized net gain	(118		)	(114		)	(236		)	(228		)
Net periodic benefit cost	$	310		$	295		$	620		$	590