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

9 Months Ended

Sep. 30, 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 September 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2018			2017			2018			2017			2018			2017
Service cost	$	1,003		$	979		$	289		$	286		$	1,292		$	1,265
Interest cost	3,154			3,445			755			725			3,909			4,170
Expected return on plan assets	(5,665		)	(5,619		)	—			—			(5,665		)	(5,619		)
Amortization of unrecognized:
Prior service cost (credit)	—			59			(51		)	(54		)	(51		)	5
Actuarial loss	1,618			1,308			158			156			1,776			1,464
Pension expense	$	110		$	172		$	1,151		$	1,113		$	1,261		$	1,285
Nine months ended September 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2018			2017			2018			2017			2018			2017
Service cost	$	3,007		$	2,937		$	865		$	814		$	3,872		$	3,751
Interest cost	9,461			10,337			2,259			2,063			11,720			12,400
Expected return on plan assets	(16,994		)	(16,859		)	—			—			(16,994		)	(16,859		)
Amortization of unrecognized:
Prior service cost (credit)	1			177			(152		)	(153		)	(151		)	24
Actuarial loss	4,854			3,925			471			446			5,325			4,371
Pension expense	$	329		$	517		$	3,443		$	3,170		$	3,772		$	3,687

Non-Pension Post-retirement 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)	2018			2017			2018			2017			2018			2017
Service cost	$	151		$	157		$	1		$	—		$	152		$	157
Interest cost	456			526			9			10			465			536
Amortization of unrecognized:
Prior service (credit)	(71		)	(50		)	—			—			(71		)	(50		)
Actuarial (gain)	(52		)	(65		)	(16		)	(13		)	(68		)	(78		)
Non-pension post-retirement benefit expense	$	484		$	568		$	(6	)	$	(3	)	$	478		$	565
Nine months ended September 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2018			2017			2018			2017			2018			2017
Service cost	$	453		$	473		$	1		$	1		$	454		$	474
Interest cost	1,367			1,578			29			32			1,396			1,610
Amortization of unrecognized:
Prior service (credit)	(212		)	(151		)	—			—			(212		)	(151		)
Actuarial (gain)	(157		)	(194		)	(49		)	(39		)	(206		)	(233		)
Non-pension post-retirement benefit expense	$	1,451		$	1,706		$	(19	)	$	(6	)	$	1,432		$	1,700