Retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Pension Benefits

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans

The following tables provide the components of net periodic benefit cost for its major defined benefit plans and its other postretirement plans.

	Pension Benefits
	Three Months Ended March 31,
	2018						2017
	U.S.			Non-U.S.			U.S.			Non-U.S.
Service cost	$	254		$	545		$	254		$	482
Interest cost	653			361			660			308
Expected return on plan assets	(983		)	(290		)	(944		)	(264		)
Net amortization	685			330			642			382
Net periodic benefit cost	$	609		$	946		$	612		$	908

Other Postretirement Benefits

Defined Benefit Plan Disclosure [Line Items]

Components of Net Periodic Benefit Cost for Defined Benefit Plans and Other Postretirement Plans

	Other Postretirement Benefits
	Three Months Ended March 31,
	2018			2017
Service cost	$	168		$	152
Interest cost	203			204
Net amortization	(184		)	(198		)
Net periodic benefit cost	$	187		$	158