Pension and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Compensation And Retirement Disclosure [Abstract]

Contributions for Pension and Other Postretirement Benefits

Contributions were as follows:

	Six Months Ended June 30,
	2018		2017
Foreign defined benefit pension plans	$	1,124	$	901
Other postretirement benefits (e.g., net payments)		566		560
U.K. defined contribution pension plan		182		139
U.S. defined contribution plan		1,319		1,248

Net Periodic Pension and Other Postretirement Costs

Net periodic pension and other postretirement costs include the following components:

	Three Months Ended June 30,						Six Months Ended June 30,
U.S. Defined Benefit Pension Plans	2018			2017			2018			2017
Service cost	$	474		$	410		$	809		$	821
Interest cost		2,071			2,099			4,111			4,197
Expected return on plan assets		(3,319	)		(3,128	)		(6,603	)		(6,255	)
Amortization of prior service cost		12			14			25			27
Amortization of actuarial loss		380			1,002			855			1,938
Curtailment loss		21			0			21			0
Net benefit (income) cost	$	(361	)	$	397		$	(782	)	$	728

	Three Months Ended June 30,						Six Months Ended June 30,
Foreign Defined Benefit Pension Plans	2018			2017			2018			2017
Service cost	$	164		$	92		$	275		$	182
Interest cost		354			458			718			903
Expected return on plan assets		(658	)		(556	)		(1,330	)		(1,094	)
Amortization of prior service credit		(85	)		0			(173	)		0
Amortization of actuarial loss		190			186			384			367
Net benefit (income) cost	$	(35	)	$	180		$	(126	)	$	358

	Three Months Ended June 30,						Six Months Ended June 30,
Other Postretirement Benefit Plans	2018			2017			2018			2017
Service cost	$	126		$	181		$	228		$	353
Interest cost		122			132			247			304
Amortization of prior service credit		(401	)		(399	)		(803	)		(804	)
Amortization of actuarial gain		(53	)		(20	)		(115	)		(12	)
Net benefit income	$	(206	)	$	(106	)	$	(443	)	$	(159	)