Pension and Non-pension Postretirement Benefits (Tables)

9 Months Ended

Sep. 30, 2017

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 September 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2017			2016			2017			2016			2017			2016
Service cost	$	979		$	929		$	286		$	313		$	1,265		$	1,242
Interest cost	3,445			3,740			725			663			4,170			4,403
Expected return on plan assets	(5,619		)	(5,757		)	—			—			(5,619		)	(5,757		)
Amortization of unrecognized:
Prior service cost (credit)	59			65			(54		)	(53		)	5			12
Actuarial loss	1,308			1,068			156			412			1,464			1,480
Pension expense	$	172		$	45		$	1,113		$	1,335		$	1,285		$	1,380
Nine months ended September 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2017			2016			2017			2016			2017			2016
Service cost	$	2,937		$	2,788		$	814		$	948		$	3,751		$	3,736
Interest cost	10,337			11,222			2,063			2,005			12,400			13,227
Expected return on plan assets	(16,859		)	(17,272		)	—			—			(16,859		)	(17,272		)
Amortization of unrecognized:
Prior service cost (credit)	177			197			(153		)	(160		)	24			37
Actuarial loss	3,925			3,204			446			817			4,371			4,021
Settlement charge	—			42			—			170			—			212
Pension expense	$	517		$	181		$	3,170		$	3,780		$	3,687		$	3,961

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 September 30,	U.S. Plans					Non-U.S. Plans						Total
(dollars in thousands)	2017			2016		2017			2016			2017			2016
Service cost	$	157		$	200	$	—		$	—		$	157		$	200
Interest cost	526			652		10			11			536			663
Amortization of unrecognized:
Prior service cost (credit)	(50		)	35		—			—			(50		)	35
Actuarial loss / (gain)	(65		)	21		(13		)	(10		)	(78		)	11
Non-pension post-retirement benefit expense	$	568		$	908	$	(3	)	$	1		$	565		$	909
Nine months ended September 30,	U.S. Plans					Non-U.S. Plans						Total
(dollars in thousands)	2017			2016		2017			2016			2017			2016
Service cost	$	473		$	598	$	1		$	1		$	474		$	599
Interest cost	1,578			1,956		32			35			1,610			1,991
Amortization of unrecognized:
Prior service cost (credit)	(151		)	105		—			—			(151		)	105
Actuarial loss / (gain)	(194		)	61		(39		)	(32		)	(233		)	29
Non-pension post-retirement benefit expense	$	1,706		$	2,720	$	(6	)	$	4		$	1,700		$	2,724