Retirement Plans (Tables) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

Sep. 30, 2016

Sep. 27, 2015

Sep. 30, 2016

Sep. 27, 2015

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

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



	Domestic Pension Plans						Foreign Pension Plans
	Three Months Ended						Three Months Ended
	September 30,			September 27,			September 30,			September 27,
	2016			2015			2016			2015
Service cost	$	21		$	42		$	13		$	16
Interest cost	2,756			2,815			12			124
Expected return on plan assets (1)	(4,744		)	(5,068		)	(33		)	(135		)
Amortization of loss	1,499			1,585			36			89
(Income) expense, net	$	(468	)	$	(626	)	$	28		$	94

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



	Domestic Pension Plans						Foreign Pension Plans
	Nine Months Ended						Nine Months Ended
	September 30, 2016			September 27, 2015			September 30, 2016			September 27, 2015
Service cost	$	65		$	128		$	38		$	49
Interest cost	8,268			8,444			34			371
Expected return on plan assets (1)	(14,232		)	(15,204		)	(19		)	(402		)
Amortization of loss	4,495			4,754			105			269
Other cost due to retirement	12			—			—			—
(Income) expense, net	$	(1,392	)	$	(1,878	)	$	158		$	287

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

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



	Three Months Ended						Nine Months Ended
	September 30,			September 27,			September 30,			September 27,
	2016			2015			2016			2015
Other post-retirement benefit plan
Service cost	$	—		$	1		$	2		$	3
Interest cost	52			51			156			153
Amortization of gain	(37		)	(25		)	(112		)	(75		)
Post-retirement expense	$	15		$	27		$	46		$	81

$ 21

$ 42

$ 65

$ 128