Retirement Plans

Pension Plans

Net pension expense (income) for our domestic and foreign plans was as follows:

The components of net pension expense (income) for our domestic and foreign plans include the following:



	Domestic Pension Plans						Foreign Pension Plans
	Three Months Ended						Three Months Ended
	June 30,			June 30,			June 30,			June 30,
	2018			2017			2018			2017
Service cost	$	—		$	—		$	11		$	12
Interest cost	1,781			2,068			11			9
Expected return on plan assets (1)	(3,225		)	(4,060		)	(6		)	(5		)
Amortization of loss	1,466			1,446			40			39
Expense (income), net	$	22		$	(546	)	$	56		$	55

(1) Expected return on plan assets is net of expected investment expenses and certain administrative expenses.



	Domestic Pension Plans						Foreign Pension Plans
	Six Months Ended						Six Months Ended
	June 30,			June 30,			June 30,			June 30,
	2018			2017			2018			2017
Service cost	$	—		$	—		$	22		$	24
Interest cost	3,562			4,136			22			17
Expected return on plan assets (1)	(6,450		)	(8,121		)	(13		)	(10		)
Amortization of loss	2,932			2,892			82			77
Other cost due to retirement	—			61			—			—
Expense (income), net	$	44		$	(1,032	)	$	113		$	108

(1) Expected return on plan assets is net of expected investment expenses and certain administrative expenses.

Other Post-retirement Benefit Plan

Net post-retirement expense for our other post-retirement plan includes the following components: