EMPLOYEE BENEFIT PLANS (Tables)

6 Months Ended

Jun. 30, 2015

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of net periodic benefit cost

The components of net periodic benefit cost related to the Company’s defined benefit plans consisted of the following:

	Three Months Ended   June 30,						Six Months Ended   June 30,
Pension Benefits	2015			2014			2015			2014
Components of net periodic benefit cost:
Service cost	$	5,789		$	4,851		$	11,579		$	9,142
Interest cost	707			601			1,416			1,171
Expected return on plan assets	(829		)	(539		)	(1,659		)	(1,063		)
Amortization of prior service costs	13			10			26			12
Amortization of actuarial loss	311			258			622			480
Net periodic benefit cost	$	5,991		$	5,181		$	11,984		$	9,742

	Three Months Ended   June 30,				Six Months Ended   June 30,
Post Retirement Medical Plan	2015		2014		2015		2014
Components of net periodic benefit cost:
Service cost	$	244	$	300	$	488	$	478
Interest cost	134		135		269		228
Amortization of prior service costs	76		75		152		55
Amortization of actuarial loss (gain)	—		1		—		(4		)
Net periodic benefit cost	$	454	$	511	$	909	$	757