EMPLOYEE BENEFIT PLANS (Tables)

3 Months Ended

Mar. 31, 2017

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   March 31,
Pension Benefits	2017			2016
Components of net periodic benefit cost:
Service cost	$	10,143		$	7,340
Interest cost	1,084			776
Expected return on plan assets	(1,442		)	(1,106		)
Amortization of prior service cost	13			13
Amortization of actuarial loss (gain)	113			194
Net periodic benefit cost	$	9,911		$	7,217

	Three Months Ended   March 31,
Post-Retirement Medical Plan	2017		2016
Components of net periodic benefit cost:
Service cost	$	316	$	220
Interest cost	172		134
Amortization of prior service cost	161		109
Amortization of actuarial loss (gain)	—		—
Net periodic benefit cost	$	649	$	463