Components of Periodic Benefit Costs (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2018 and 2017 includes the following components:

	For the Three Months Ended June 30,
	Pension						RIM				Post-retirement
	2018			2017			2018		2017		2018			2017
	(In thousands)
Service cost	$	1,780		$	1,547		$	61	$	35	$	93		$	112
Interest cost	2,129			2,024			111		96		205			214
Expected return on plan assets	(4,815		)	(5,677		)	—		—		—			—
Amortization:
Prior service cost	—			—			—		—		(34		)	(34		)
Net loss	707			2,123			103		71		69			85
Net periodic cost (income)	$	(199	)	$	17		$	275	$	202	$	333		$	377

	For the Six Months Ended June 30,
	Pension						RIM				Post-retirement
	2018			2017			2018		2017		2018			2017
	(In thousands)
Service cost	$	3,560		$	3,094		$	122	$	70	$	186		$	224
Interest cost	4,258			4,048			222		192		410			428
Expected return on plan assets	(9,630		)	(11,354		)	—		—		—			—
Amortization:
Prior service cost	—			—			—		—		(68		)	(68		)
Net loss	1,414			4,246			206		142		138			170
Net periodic cost (income)	$	(398	)	$	34		$	550	$	404	$	666		$	754