PENSION AND POSTRETIREMENT PLANS (Tables)

6 Months Ended

Jun. 30, 2015

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, 2015 and 2014 is presented below (in thousands):

	Pension Benefits						Postretirement Benefits
	Three Months Ended   June 30,						Three Months Ended   June 30,
	2015			2014			2015			2014
Service cost	$	498		$	362		$	3		$	3
Interest cost	1,678			2,124			18			22
Expected return on plan assets	(2,413		)	(2,501		)	—			—
Amortization of prior service credit	(82		)	(102		)	—			—
Amortization of transition asset	(21		)	(71		)	—			—
Amortization of actuarial loss (gain)	784			436			(12		)	(14		)
Net periodic cost	$	444		$	248		$	9		$	11
	Pension Benefits						Postretirement Benefits
	Six Months Ended   June 30,						Six Months Ended   June 30,
	2015			2014			2015			2014
Service cost	$	991		$	726		$	6		$	6
Interest cost	3,351			4,244			37			44
Expected return on plan assets	(4,813		)	(4,996		)	—			—
Amortization of prior service credit	(162		)	(204		)	—			—
Amortization of transition asset	(42		)	(142		)	—			—
Amortization of actuarial loss (gain)	1,562			871			(25		)	(28		)
Net periodic cost	$	887		$	499		$	18		$	22