EMPLOYEE BENEFIT PLANS (Tables)

9 Months Ended

Sep. 30, 2018

Defined Benefit Plan [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	2018			2017			2018			2017
Components of net periodic benefit cost:
Service cost	$	11,836		$	10,142		$	35,508		$	30,429
Interest cost	1,448			1,084			4,344			3,252
Expected return on plan assets	(2,135		)	(1,441		)	(6,405		)	(4,325		)
Amortization of prior service cost	22			13			65			39
Amortization of actuarial loss	71			113			214			339
Net periodic benefit cost	$	11,242		$	9,911		$	33,726		$	29,734

	Three Months Ended   September 30,				Nine Months Ended   September 30,
Post-Retirement Medical Plan	2018		2017		2018		2017
Components of net periodic benefit cost:
Service cost	$	287	$	316	$	861	$	948
Interest cost	155		172		465		516
Amortization of prior service cost	161		162		484		484
Net periodic benefit cost	$	603	$	650	$	1,810	$	1,948