Pension and Non-pension Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2017

Defined Benefit Pension Plan [Member]

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)	2017			2016			2017			2016			2017			2016
Service cost	$	1,075		$	996		$	251		$	317		$	1,326		$	1,313
Interest cost	3,450			3,777			637			672			4,087			4,449
Expected return on plan assets	(5,617		)	(5,755		)	—			—			(5,617		)	(5,755		)
Amortization of unrecognized:
Prior service cost (credit)	59			66			(47		)	(54		)	12			12
Actuarial loss	1,352			1,120			138			202			1,490			1,322
Pension expense	$	319		$	204		$	979		$	1,137		$	1,298		$	1,341

Non-Pension Postretirement Benefit Plans [Member]

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 March 31,	U.S. Plans					Non-U.S. Plans						Total
(dollars in thousands)	2017			2016		2017			2016			2017			2016
Service cost	$	220		$	199	$	—		$	—		$	220		$	199
Interest cost	581			652		11			12			592			664
Amortization of unrecognized:
Prior service cost (credit)	(50		)	35		—			—			(50		)	35
Actuarial loss / (gain)	25			20		(13		)	(11		)	12			9
Non-pension postretirement benefit expense	$	776		$	906	$	(2	)	$	1		$	774		$	907