PENSION AND OTHER POST-RETIREMENT BENEFIT PLANS

Defined Benefit and Post-retirement Healthcare Plans

ABX sponsors a qualified defined benefit pension plan for ABX crewmembers and a qualified defined benefit pension plan for a major portion of its other ABX employees that meet minimum eligibility requirements. ABX also sponsors non-qualified defined benefit pension plans for certain employees. These non-qualified plans are unfunded. Employees are no longer accruing benefits under any of the defined benefit pension plans. ABX also sponsors a post-retirement healthcare plan for its ABX employees, which is unfunded. Benefits for covered individuals terminate upon reaching age 65 under the post-retirement healthcare plans.

The accounting and valuation for these post-retirement obligations are determined by prescribed accounting and actuarial methods that consider a number of assumptions and estimates. The selection of appropriate assumptions and estimates is significant due to the long time period over which benefits will be accrued and paid. The long term nature of these benefit payouts increases the sensitivity of certain estimates of our post-retirement costs. The assumptions considered most sensitive in actuarially valuing ABX’s pension obligations and determining related expense amounts are discount rates and expected long term investment returns on plan assets. Additionally, other assumptions concerning retirement ages, mortality and employee turnover also affect the valuations. Actual results and future changes in these assumptions could result in future costs significantly higher than those recorded in our results of operations.

ABX measures plan assets and benefit obligations as of December 31 of each year. Information regarding ABX’s sponsored defined benefit pension plans and post-retirement healthcare plans follow below. The accumulated benefit obligation reflects pension benefit obligations based on the actual earnings and service to-date of current employees.

The Company’s net periodic benefit costs for its defined benefit pension plans and post-retirement healthcare plans for both continuing and discontinued operations are as follows (in thousands):



	Three Months Ended September 30,											Nine Months Ended September 30,
	Pension Plans						Post-Retirement Healthcare Plan					Pension Plans						Post-Retirement Healthcare Plan
	2018			2017			2018		2017			2018			2017			2018		2017
Service cost	$	—		$	—		$	30	$	39		$	—		$	—		$	90	$	117
Interest cost	7,284			8,396			32		36			21,852			25,946			96		108
Expected return on plan assets	(10,523		)	(10,520		)	—		—			(31,569		)	(32,379		)	—		—
Settlement charge	—			12,923			—		—			—			12,923			—		—
Amortization of prior service cost	—			—			—		(13		)	—			—			—		(39		)
Amortization of net (gain) loss	887			1,944			55		71			2,661			5,819			165		213
Net periodic benefit cost (income)	$	(2,352	)	$	12,743		$	117	$	133		$	(7,056	)	$	12,309		$	351	$	399

During the nine month period ending September 30, 2018, the Company contributed $22.2 million to the pension plans. The Company expects to contribute an additional $0.2 million during the remainder of 2018.