Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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Fair value portion of assets classified as held for sale.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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The cash inflow from sale of buildings.

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Impairment Charges - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impairment charges		$ 544	$ 1,329	$ 0
Additional loss on sale of buliding		3,482	(628)	$ (556)
Material Handling [Member]
Impairment charges			$ 1,300
Manufacturing Plant Closing [Member] \| Scarborough, Ontario, Canada [Member]
Impairment charges	$ 500
Proceeds from sale of building		3,100
Additional loss on sale of buliding		$ (100)
Other Assets [Member] \| Manufacturing Plant Closing [Member] \| Scarborough, Ontario, Canada [Member] \| Level 2 [Member]
Building classified as held for sale, fair value	$ 3,200