RETIREMENT PLANS (Tables)

6 Months Ended

Jun. 30, 2018

Pension Plan [Member]

Defined Benefit Plan Disclosure [Line Items]

Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s defined benefit plans for the three months and six months ended June 30, 2018 and 2017 were as follows (in thousands):

	Pension Benefits
	Pension Plan						SERP
	Three months ended June 30,						Three months ended June 30,
Components of net periodic benefit cost:	2018			2017			2018		2017
Service cost	$	1,867		$	2,865		$	—	$	—
Interest cost		3,974			3,409			12		15
Expected return on plan assets		(5,693	)		(4,568	)		—		—
Amortization of actuarial loss		740			1,069			6		7
Net periodic benefit cost	$	888		$	2,775		$	18	$	22

	Pension Benefits
	Pension Plan						SERP
	Six months ended June 30,						Six months ended June 30,
Components of net periodic benefit cost:	2018			2017			2018		2017
Service cost	$	4,094		$	7,192		$	—	$	—
Interest cost		7,605			7,089			24		29
Expected return on plan assets		(11,016	)		(9,005	)		—		—
Amortization of actuarial loss		1,445			2,438			12		14
Net periodic benefit cost	$	2,128		$	7,714		$	36	$	43

Other Postretirement Benefits [Member]

Defined Benefit Plan Disclosure [Line Items]

Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s postretirement benefit plan for the three months and six months ended June 30, 2018 and 2017 were as follows (in thousands):

	Other Postretirement Benefits						Other Postretirement Benefits
	Postretirement Welfare Plan						Postretirement Welfare Plan
	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Components of net periodic benefit cost:
Service cost	$	—		$	—		$	—			$	—
Interest cost		6			7			12				14
Amortization of actuarial gain		(149	)		(168	)		(298	)			(335	)
Net periodic benefit cost	$	(143	)	$	(161	)	$	(286	)		$	(321	)