Basis of Presentation and Significant Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 1,344,342	$ 1,272,093
Less: Accumulated depreciation	688,137	691,852
Property, Plant and Equipment, Net	656,205	580,241
Land
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	9,349	8,919
Buildings
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	254,951	221,462
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	780,088	775,997
Property under construction
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment	$ 299,954	$ 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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