Other Items Impacting Comparability (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
Oct. 01, 2018	Oct. 01, 2017	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Items Impacting Comparability [Abstract]
Restructuring charges and fees, net				$ 9,594	$ 21,405	$ 5,074
Goodwill impairment charge	$ 0	$ 0	$ 15,513	15,513	0	0
Tax reform related bonus				0	23,278	0
Operating tax adjustment				0	2,205	0
Pension related adjustments				0	5,454	7,650
Gain on sale of property				0	(24,122)	0
Restructuring and other items, net				$ 25,107	$ 28,220	$ 12,724

Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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