Pension and Non-pension Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2016

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 June 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2016			2015			2016			2015			2016			2015
Service cost	$	863		$	1,022		$	318		$	762		$	1,181		$	1,784
Interest cost	3,705			3,649			670			1,107			4,375			4,756
Expected return on plan assets	(5,760		)	(5,668		)	—			(638		)	(5,760		)	(6,306		)
Amortization of unrecognized:
Prior service cost	66			105			(53		)	(61		)	13			44
Actuarial loss	1,016			1,759			203			409			1,219			2,168
Settlement charge	42			—			170			—			212			—
Pension expense	$	(68	)	$	867		$	1,308		$	1,579		$	1,240		$	2,446
Six months ended June 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2016			2015			2016			2015			2016			2015
Service cost	$	1,859		$	2,183		$	635		$	1,510		$	2,494		$	3,693
Interest cost	7,482			7,358			1,342			2,210			8,824			9,568
Expected return on plan assets	(11,515		)	(11,330		)	—			(1,236		)	(11,515		)	(12,566		)
Amortization of unrecognized:
Prior service cost	132			209			(107		)	(125		)	25			84
Actuarial loss	2,136			3,645			405			815			2,541			4,460
Settlement charge	42			—			170			—			212			—
Pension expense	$	136		$	2,065		$	2,445		$	3,174		$	2,581		$	5,239

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 June 30,	U.S. Plans				Non-U.S. Plans						Total
(dollars in thousands)	2016		2015		2016			2015			2016		2015
Service cost	$	199	$	145	$	1		$	1		$	200	$	146
Interest cost	652		609		12			10			664		619
Amortization of unrecognized:
Prior service cost	35		35		—			—			35		35
Actuarial loss / (gain)	20		100		(11		)	(24		)	9		76
Non-pension postretirement benefit expense	$	906	$	889	$	2		$	(13	)	$	908	$	876
Six months ended June 30,	U.S. Plans				Non-U.S. Plans						Total
(dollars in thousands)	2016		2015		2016			2015			2016		2015
Service cost	$	398	$	427	$	1		$	1		$	399	$	428
Interest cost	1,304		1,269		24			29			1,328		1,298
Amortization of unrecognized:
Prior service cost	70		70		—			—			70		70
Actuarial loss / (gain)	40		296		(22		)	(24		)	18		272
Non-pension postretirement benefit expense	$	1,812	$	2,062	$	3		$	6		$	1,815	$	2,068