EMPLOYEE BENEFIT PLANS (Tables)

9 Months Ended

Sep. 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   September 30,						Nine Months Ended   September 30,
Pension Benefits	2015			2014			2015			2014
Components of net periodic benefit cost:
Service cost	$	5,790		$	5,134		$	17,369		$	14,276
Interest cost	710			616			2,126			1,787
Expected return on plan assets	(830		)	(546		)	(2,489		)	(1,609		)
Amortization of prior service costs	13			13			39			26
Amortization of loss	311			277			933			757
Net periodic benefit cost	$	5,994		$	5,494		$	17,978		$	15,237

	Three Months Ended   September 30,				Nine Months Ended   September 30,
Post Retirement Medical Plan	2015		2014		2015		2014
Components of net periodic benefit cost:
Service cost	$	243	$	269	$	731	$	747
Interest cost	134		125		403		353
Amortization of prior service costs	76		52		228		107
Amortization of loss (gain)	—		—		—		(4		)
Net periodic benefit cost	$	453	$	446	$	1,362	$	1,203