Basis of Presentation and Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 1,410,411	$ 1,272,093
Less: Accumulated depreciation	695,313	691,852
Property, Plant and Equipment, Net	715,098	580,241
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment	9,356	8,919
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment	256,560	221,462
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment	789,972	775,997
Property under construction
Property, Plant and Equipment [Line Items]
Property, plant and equipment	$ 354,523	$ 265,715

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 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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