RETIREMENT PLANS (Tables)

6 Months Ended

Jun. 30, 2017

Defined Benefit Plan Disclosure [Line Items]

The components of net periodic benefit cost for the Company’s defined benefit plans for the three months and six months ended June 30, 2017 and 2016 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:	2017			2016			2017		2016
Service cost	$	2,865		$	3,482		$	—	$	—
Interest cost		3,409			3,651			15		17
Expected return on plan assets		(4,568	)		(4,251	)		—		—
Amortization of actuarial loss		1,069			1,525			7		6
Net periodic benefit cost	$	2,775		$	4,407		$	22	$	23

	Pension Benefits
	Pension Plan						SERP
	Six months ended June 30,						Six months ended June 30,
Components of net periodic benefit cost:	2017			2016			2017		2016
Service cost	$	7,192		$	6,702		$	—	$	—
Interest cost		7,089			7,063			29		33
Expected return on plan assets		(9,005	)		(8,404	)		—		—
Amortization of actuarial loss		2,438			2,743			14		13
Net periodic benefit cost	$	7,714		$	8,104		$	43	$	46

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 and six months ended June 30, 2017 and 2016 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,
	2017			2016			2017			2016
Components of net periodic benefit cost:
Service cost	$	—		$	—		$	—		$	—
Interest cost		7			3			14			15
Amortization of actuarial gain		(168	)		(186	)		(335	)		(374	)
Net periodic benefit cost	$	(161	)	$	(183	)	$	(321	)	$	(359	)