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Major Accounting Policies - Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Property plant and equipment |  |
Property, plant and equipment, at cost | $ 2,295,610 | $ 2,139,414
Buildings |  |
Property plant and equipment |  |
Property, plant and equipment, at cost | $ 316,398 | 322,495
Buildings | Minimum |  |
Property plant and equipment |  |
Estimated Useful Service Lives | 20 years |
Buildings | Maximum |  |
Property plant and equipment |  |
Estimated Useful Service Lives | 40 years |
Building and leasehold improvements |  |
Property plant and equipment |  |
Property, plant and equipment, at cost | $ 177,306 | 167,552
Building and leasehold improvements | Minimum |  |
Property plant and equipment |  |
Estimated Useful Service Lives | 6 years |
Building and leasehold improvements | Maximum |  |
Property plant and equipment |  |
Estimated Useful Service Lives | 20 years |
Machinery and equipment |  |
Property plant and equipment |  |
Property, plant and equipment, at cost | $ 1,501,452 | 1,364,231
Machinery and equipment | Minimum |  |
Property plant and equipment |  |
Estimated Useful Service Lives | 2 years |
Machinery and equipment | Maximum |  |
Property plant and equipment |  |
Estimated Useful Service Lives | 10 years |
Furniture and fixtures |  |
Property plant and equipment |  |
Property, plant and equipment, at cost | $ 155,423 | $ 157,104
Furniture and fixtures | Minimum |  |
Property plant and equipment |  |
Estimated Useful Service Lives | 2 years |
Furniture and fixtures | Maximum |  |
Property plant and equipment |  |
Estimated Useful Service Lives | 10 years |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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