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

6 Months Ended

Jun. 30, 2019

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 (supplemental employee retirement plan), are as follows:

Three months ended June 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2019			2018			2019			2018			2019			2018
Service cost	$	783		$	1,025		$	260		$	284		$	1,043		$	1,309
Interest cost	3,382			3,142			772			741			4,154			3,883
Expected return on plan assets	(5,193		)	(5,669		)	—			—			(5,193		)	(5,669		)
Amortization of unrecognized:
Prior service cost (credit)	—			1			(51		)	(50		)	(51		)	(49		)
Actuarial loss	1,088			1,599			105			154			1,193			1,753
Pension expense	$	60		$	98		$	1,086		$	1,129		$	1,146		$	1,227
Six months ended June 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2019			2018			2019			2018			2019			2018
Service cost	$	1,566		$	2,004		$	519		$	576		$	2,085		$	2,580
Interest cost	6,764			6,307			1,541			1,504			8,305			7,811
Expected return on plan assets	(10,386		)	(11,329		)	—			—			(10,386		)	(11,329		)
Amortization of unrecognized:
Prior service cost (credit)	—			1			(101		)	(101		)	(101		)	(100		)
Actuarial loss	2,175			3,236			208			313			2,383			3,549
Pension expense	$	119		$	219		$	2,167		$	2,292		$	2,286		$	2,511

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 June 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2019			2018			2019			2018			2019			2018
Service cost	$	112		$	151		$	—		$	—		$	112		$	151
Interest cost	449			455			9			10			458			465
Amortization of unrecognized:
Prior service (credit)	(71		)	(70		)	—			—			(71		)	(70		)
Actuarial (gain)	(106		)	(53		)	(19		)	(17		)	(125		)	(70		)
Non-pension post-retirement benefit expense	$	384		$	483		$	(10	)	$	(7	)	$	374		$	476
Six months ended June 30,	U.S. Plans						Non-U.S. Plans						Total
(dollars in thousands)	2019			2018			2019			2018			2019			2018
Service cost	$	222		$	302		$	—		$	—		$	222		$	302
Interest cost	918			911			18			20			936			931
Amortization of unrecognized:
Prior service (credit)	(141		)	(141		)	—			—			(141		)	(141		)
Actuarial (gain)	(188		)	(105		)	(37		)	(33		)	(225		)	(138		)
Non-pension post-retirement benefit expense	$	811		$	967		$	(19	)	$	(13	)	$	792		$	954