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Retirement Benefits (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended
	Jun. 01, 2018	Dec. 31, 2018	Dec. 31, 2017
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic retirement (benefit) cost		$ (305)	$ (792)
Contributions paid - pensions		554	312
Defined Benefit Pension Plan [Member] | Business Acquisition, Acquiree - L'Orange [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension obligation assumed in L'Orange aquisition	$ 39,257
Current portion of pension obligation	$ 1,143
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic retirement (benefit) cost		302	(52)
United States [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic retirement (benefit) cost		(706)	(665)
Foreign Plan [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Net periodic retirement (benefit) cost		401	(127)
Contributions paid - pensions		$ 554	$ 312

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Amount of increase in benefit obligation of defined benefit plan from business combination.

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