PENSION AND POSTRETIREMENT PLANS (Tables)

6 Months Ended

Jun. 30, 2016

Pension and Other Postretirement Benefit Expense [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 six months ended June 30, 2016 and 2015 is presented below (in thousands):

	Pension Benefits						Postretirement Benefits
	Three Months Ended   June 30,						Three Months Ended   June 30,
	2016			2015			2016			2015
Service cost	$	569		$	498		$	3		$	3
Interest cost	1,676			1,678			19			18
Expected return on plan assets	(2,328		)	(2,413		)	—			—
Amortization of prior service credit	(64		)	(82		)	—			—
Amortization of transition asset	(79		)	(21		)	—			—
Amortization of actuarial loss (gain)	957			784			(14		)	(12		)
Net periodic cost	$	731		$	444		$	8		$	9
	Pension Benefits						Postretirement Benefits
	Six Months Ended   June 30,						Six Months Ended   June 30,
	2016			2015			2016			2015
Service cost	$	1,128		$	991		$	6		$	6
Interest cost	3,348			3,351			38			37
Expected return on plan assets	(4,637		)	(4,813		)	—			—
Amortization of prior service credit	(127		)	(162		)	—			—
Amortization of transition asset	(156		)	(42		)	—			—
Amortization of actuarial loss (gain)	1,900			1,562			(28		)	(25		)
Net periodic cost	$	1,456		$	887		$	16		$	18