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Inventories And Deferred Preservation Costs (Narrative) (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Inventory [Line Items] |  |
Consignment inventory | $ 12.5 | $ 12.0
Domestic [Member] |  |
Inventory [Line Items] |  |
Consignment inventory percentage | 49.00% | 51.00%
Foreign [Member] |  |
Inventory [Line Items] |  |
Consignment inventory percentage | 51.00% | 49.00%

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- Definition Consignment inventory percentage. + References No definition available. + Details
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Period Type: | instant

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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 Gross amount of inventory owned by the entity but in the hands of a customer, typically a reseller. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)(a)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |