Property, plant, equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Land, buildings and leasehold improvements	$ 224,605	$ 207,927
Machinery and equipment	421,873	384,710
Computer equipment and software	137,899	122,890
Construction in progress	105,319	73,920
Property, plant and equipment, gross	889,696	789,447
Less: Accumulated depreciation	(456,930)	(406,448)
Property, plant and equipment, net	$ 432,766	$ 382,999	$ 302,899

Land buildings and leasehold improvements gross.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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Amount before accumulated depreciation of tangible personal property used to produce goods and services, including, but is not limited to, tools, dies and molds, computer and office equipment.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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