RETIREMENT PLANS (Tables)

3 Months Ended

Mar. 31, 2018

Pension Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s defined benefit plans for the three months ended March 31, 2018 and 2017 were as follows (in thousands):

	Pension Benefits
	Pension Plan						SERP
	Three months ended March 31,						Three months ended March 31,
Components of net periodic benefit cost:	2018			2017			2018		2017
Service cost	$	2,227		$	4,327		$	—	$	—
Interest cost		3,631			3,680			12		14
Expected return on plan assets		(5,323	)		(4,437	)		—		—
Amortization of actuarial loss		705			1,369			6		7
Net periodic benefit cost	$	1,240		$	4,939		$	18	$	21

Other Postretirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s postretirement benefit plan for the three months ended March 31, 2018 and 2017 were as follows (in thousands):

	Other Postretirement Benefits
	Postretirement Welfare Plan
	Three months ended March 31,
	2018			2017
Components of net periodic benefit cost:
Service cost	$	—		$	—
Interest cost		6			7
Amortization of actuarial gain		(149	)		(167	)
Net periodic benefit cost	$	(143	)	$	(160	)