PENSION AND POSTRETIREMENT PLANS (Tables)

9 Months Ended

Sep. 30, 2017

Pension and Other Postretirement Benefits Cost (Reversal of Cost) [Abstract]

Summary of the components of net periodic pension benefit costs

A summary of the components of net periodic pension and postretirement benefit costs for the three and nine months ended September 30, 2017 and 2016 is presented below (in thousands):

	Pension Benefits						Postretirement Benefits
	Three Months Ended   September 30,						Three Months Ended   September 30,
	2017			2016			2017			2016
Service cost	$	493		$	566		$	3		$	3
Interest cost	1,510			1,662			18			19
Expected return on plan assets	(2,143		)	(2,305		)	—			—
Amortization of prior service credit	(79		)	(64		)	—			—
Amortization of transition asset	—			(78		)	—			—
Amortization of actuarial loss (gain)	943			951			(11		)	(14		)
Settlement loss (gain)	45			765			—			—
Net periodic cost	$	769		$	1,497		$	10		$	8
	Pension Benefits						Postretirement Benefits
	Nine Months Ended   September 30,						Nine Months Ended   September 30,
	2017			2016			2017			2016
Service cost	$	1,467		$	1,695		$	9		$	9
Interest cost	4,511			5,010			54			57
Expected return on plan assets	(6,379		)	(6,942		)	—			—
Amortization of prior service credit	(233		)	(191		)	—			—
Amortization of transition asset	—			(234		)	—			—
Amortization of actuarial loss (gain)	2,810			2,850			(33		)	(42		)
Settlement loss (gain)	75			765			—			—
Net periodic cost	$	2,251		$	2,953		$	30		$	24