Components of Periodic Benefit Costs (Tables)

9 Months Ended

Sep. 30, 2018

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

Net periodic benefit cost (income) for pension benefits and other benefits for the three and nine months ended September 30, 2018 and 2017 includes the following components:

	For the Three Months Ended September 30,
	Pension						RIM				Post-retirement
	2018			2017			2018		2017		2018			2017
	(In thousands)
Service cost	$	1,780		$	1,905		$	61	$	59	$	93		$	35
Interest cost	2,129			2,111			111		107		205			186
Expected return on plan assets	(4,815		)	(6,202		)	—		—		—			—
Amortization:
Prior service cost	—			—			—		—		(34		)	(34		)
Net loss	707			2,750			103		113		69			81
Net periodic benefit cost (income)	$	(199	)	$	564		$	275	$	279	$	333		$	268

	For the Nine Months Ended September 30,
	Pension						RIM				Post-retirement
	2018			2017			2018		2017		2018			2017
	(In thousands)
Service cost	$	5,340		$	5,715		$	183	$	177	$	279		$	105
Interest cost	6,387			6,333			333		321		615			558
Expected return on plan assets	(14,445		)	(18,606		)	—		—		—			—
Amortization:
Prior service cost	—			—			—		—		(102		)	(102		)
Net loss	2,121			8,250			309		339		207			243
Net periodic benefit cost (income)	$	(597	)	$	1,692		$	825	$	837	$	999		$	804