Pension and Non-pension Postretirement Benefits (Tables)

6 Months Ended

Jun. 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 June 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2017			2016			2017			2016			2017			2016
Service cost	$	883		$	863		$	277		$	318		$	1,160		$	1,181
Interest cost	3,442			3,705			701			670			4,143			4,375
Expected return on plan assets	(5,623		)	(5,760		)	—			—			(5,623		)	(5,760		)
Amortization of unrecognized:
Prior service cost (credit)	59			66			(52		)	(53		)	7			13
Actuarial loss	1,265			1,016			152			203			1,417			1,219
Settlement charge	—			42			—			170			—			212
Pension expense	$	26		$	(68	)	$	1,078		$	1,308		$	1,104		$	1,240
Six months ended June 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2017			2016			2017			2016			2017			2016
Service cost	$	1,958		$	1,859		$	528		$	635		$	2,486		$	2,494
Interest cost	6,892			7,482			1,338			1,342			8,230			8,824
Expected return on plan assets	(11,240		)	(11,515		)	—			—			(11,240		)	(11,515		)
Amortization of unrecognized:
Prior service cost (credit)	118			132			(99		)	(107		)	19			25
Actuarial loss	2,617			2,136			290			405			2,907			2,541
Settlement charge	—			42			—			170			—			212
Pension expense	$	345		$	136		$	2,057		$	2,445		$	2,402		$	2,581

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 postretirement benefit expense consists of the following:

Three months ended June 30,	U.S. Plans					Non-U.S. Plans						Total
(dollars in thousands)	2017			2016		2017			2016			2017			2016
Service cost	$	96		$	199	$	—		$	1		$	96		$	200
Interest cost	471			652		11			12			482			664
Amortization of unrecognized:
Prior service cost (credit)	(51		)	35		—			—			(51		)	35
Actuarial loss / (gain)	(154		)	20		(13		)	(11		)	(167		)	9
Non-pension postretirement benefit expense	$	362		$	906	$	(2	)	$	2		$	360		$	908
Six months ended June 30,	U.S. Plans					Non-U.S. Plans						Total
(dollars in thousands)	2017			2016		2017			2016			2017			2016
Service cost	$	316		$	398	$	—		$	1		$	316		$	399
Interest cost	1,052			1,304		22			24			1,074			1,328
Amortization of unrecognized:
Prior service cost (credit)	(101		)	70		—			—			(101		)	70
Actuarial loss / (gain)	(129		)	40		(26		)	(22		)	(155		)	18
Non-pension postretirement benefit expense	$	1,138		$	1,812	$	(4	)	$	3		$	1,134		$	1,815