EMPLOYEE BENEFIT PLANS

6 Months Ended

Jun. 30, 2016

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

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS

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	2016			2015			2016			2015
Components of net periodic benefit cost:
Service cost	$	7,339		$	5,789		$	14,679		$	11,579
Interest cost	775			707			1,551			1,416
Expected return on plan assets	(1,107		)	(829		)	(2,213		)	(1,659		)
Amortization of prior service costs	13			13			26			26
Amortization of loss	194			311			388			622
Net periodic benefit cost	$	7,214		$	5,991		$	14,431		$	11,984

	Three Months Ended   June 30,				Six Months Ended   June 30,
Post Retirement Medical Plan	2016		2015		2016		2015
Components of net periodic benefit cost:
Service cost	$	219	$	244	$	439	$	488
Interest cost	133		134		267		269
Amortization of prior service costs	109		76		218		152
Amortization of loss	—		—		—		—
Net periodic benefit cost	$	461	$	454	$	924	$	909