Retirement Benefits (Tables)

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Net Periodic Benefit Cost (Credit)

Net periodic benefit cost (credit) of our U.S. pension plans (including our unfunded nonqualified plans), non-U.S. pension plans, and postretirement health care and life insurance benefit plans for the three months ended September 30, 2020 and 2019, respectively, follow:

	U.S. Pension Plans				Non-U.S. Pension Plans				Other Benefit Plans
	Three Months Ended September 30,
(Dollars in thousands)	2020		2019		2020		2019		2020		2019
Service cost	$	3	$	3	$	325	$	266	$	1	$	1
Interest cost		2,387		2,963		379		405		132		175
Expected return on plan assets		(3,708)		(3,153)		(128)		(144)		—		—
Amortization of prior service cost		—		—		(5)		(6)		—		—
Net periodic benefit (credit) cost	$	(1,318)	$	(187)	$	571	$	521	$	133	$	176

Net periodic benefit (credit) cost for the nine months ended September 30, 2020 and 2019, respectively, follow:

	U.S. Pension Plans				Non-U.S. Pension Plans				Other Benefit Plans
	Nine Months Ended September 30,
(Dollars in thousands)	2020		2019		2020		2019		2020		2019
Service cost	$	9	$	8	$	904	$	877	$	2	$	2
Interest cost		7,162		8,889		1,052		1,353		397		526
Expected return on plan assets		(11,124)		(9,458)		(356)		(480)		—		—
Amortization of prior service cost		—		—		(14)		(15)		—		—
Net periodic benefit (credit) cost	$	(3,953)	$	(561)	$	1,586	$	1,735	$	399	$	528