Pension and Non-pension Post-retirement Benefits (Tables)

3 Months Ended

Mar. 31, 2018

Defined Benefit Pension Plan

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

The components of our net pension expense, including the SERP, are as follows:

Three months ended March 31,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2018			2017			2018			2017			2018			2017
Service cost	$	979		$	1,075		$	292		$	251		$	1,271		$	1,326
Interest cost	3,165			3,450			763			637			3,928			4,087
Expected return on plan assets	(5,660		)	(5,617		)	—			—			(5,660		)	(5,617		)
Amortization of unrecognized:
Prior service cost (credit)	—			59			(51		)	(47		)	(51		)	12
Actuarial loss	1,637			1,352			159			138			1,796			1,490
Pension expense	$	121		$	319		$	1,163		$	979		$	1,284		$	1,298

Non-Pension Postretirement Benefit Plans

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

The provision for our non-pension, post-retirement, benefit expense consists of the following:

Three months ended March 31,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2018			2017			2018			2017			2018			2017
Service cost	$	151		$	220		$	—		$	—		$	151		$	220
Interest cost	456			581			10			11			466			592
Amortization of unrecognized:
Prior service cost (credit)	(71		)	(50		)	—			—			(71		)	(50		)
Actuarial loss / (gain)	(52		)	25			(16		)	(13		)	(68		)	12
Non-pension post-retirement benefit expense	$	484		$	776		$	(6	)	$	(2	)	$	478		$	774