Retirement Benefits (Tables)

6 Months Ended

Jun. 30, 2020

Defined Benefit Pension Plan [Member]

Net Periodic Benefit Cost For U.S. Employees

Pension Benefits	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in thousands)	2020		2019		2020		2019
Service cost	$	2,041	$	2,276	$	6,052	$	4,552
Interest cost		2,563		2,930		5,046		5,860
Expected return on plan assets		(5,197)		(5,016)		(10,394)		(10,031)
Amortization of net (income) loss		2,462		1,601		3,675		3,203
FAS 88 settlement charge		-		104		-		208
Net periodic benefit cost	$	1,869	$	1,895	$	4,379	$	3,792

Post-Retirement Plan [Member]

Net Periodic Benefit Cost For U.S. Employees

Other Benefits	Three Months Ended				Six Months Ended
	June 30,				June 30,
(Dollars in thousands)	2020		2019		2020		2019
Service cost	$	311	$	286	$	452	$	573
Interest cost		215		295		429		590
Amortization of prior service cost		(176)		(144)		(224)		(289)
Net periodic benefit cost	$	350	$	437	$	657	$	874