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Property, Plant and Equipment (Schedule of Plant Property and Equipment) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, gross | $ 537,785 |
Property plant and equipment, gross |  | $ 517,991
Accumulated depreciation | (341,119) |
Accumulated depreciation | (341,119) | (317,414)
Property, plant and equipment, net | 196,666 | 200,577
Equipment in process | 63,580 | 42,182
Total property, plant and equipment, net | 260,246 |
Total property, plant and equipment, net |  | 242,759
Land |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, gross | 21,697 |
Property plant and equipment, gross |  | 21,525
Buildings and improvements |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, gross | 165,968 |
Property plant and equipment, gross |  | 175,279
Machinery and equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, gross | 281,771 |
Property plant and equipment, gross |  | 256,301
Office equipment |  |
Property, Plant and Equipment [Line Items] |  |
Property plant and equipment, gross | $ 68,349 |
Property plant and equipment, gross |  | $ 64,886

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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