Pensions and Other Post-employment Benefits

The following is a summary of the net periodic benefit cost for the second quarter and first six months of 2018 and 2017 for the domestic pension plans (which include the defined benefit pension plan and the supplemental retirement plans) and the domestic retiree medical plan.



	Pension Benefits						Other Benefits
	Second Quarter Ended						Second Quarter Ended
	June 29,			June 30,			June 29,			June 30,
(Thousands)	2018			2017			2018			2017
Components of net periodic benefit cost (benefit)
Service cost	$	1,674		$	1,777		$	28		$	23
Interest cost	2,397			2,370			99			99
Expected return on plan assets	(3,697		)	(3,378		)	—			—
Amortization of prior service benefit	(30		)	(73		)	(374		)	(374		)
Amortization of net loss	1,959			1,611			—			—
Net periodic benefit cost (benefit)	$	2,303		$	2,307		$	(247	)	$	(252	)



	Pension Benefits						Other Benefits
	Six Months Ended						Six Months Ended
	June 29,			June 30,			June 29,			June 30,
(Thousands)	2018			2017			2018			2017
Components of net periodic benefit cost (benefit)
Service cost	$	3,348		$	3,496		$	56		$	46
Interest cost	4,794			4,726			198			198
Expected return on plan assets	(7,394		)	(6,743		)	—			—
Amortization of prior service benefit	(61		)	(194		)	(749		)	(748		)
Amortization of net loss	3,919			3,198			—			—
Net periodic benefit cost (benefit)	$	4,606		$	4,483		$	(495	)	$	(504	)

The Company made contributions to the domestic defined benefit pension plan of $13.0 million and $4.0 million in the first six months of 2018 and 2017, respectively.

Beginning in 2018, the Company reports the service cost component of net periodic benefit cost in the same line item as other compensation costs in operating expenses and the non-service cost components of net periodic benefit cost in Other non-operating expenses. Additionally, Pension Benefit Guaranty Corporation premiums are reported within expected return on plan assets.