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Accumulated Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of sales | $ 406,143 | $ 483,552 | $ 690,193
Selling, general and administrative expenses | 32,911 | 36,376 | 41,663
Accumulated Defined Benefit Plans Adjustment, Amortization of Unrecognized Net Loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of sales | 514 | 279 | 333
Selling, general and administrative expenses | (39) | 220 | 107
Accumulated Postretirement Plans Adjustment, Amortization of Unrecognized Net Loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of sales |  |  | 567
Selling, general and administrative expenses |  |  | 80
Accumulated Postretirement Plans Adjustment Amortization Of Unrecognized Net Gain [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of sales | (8) | (80) |
Selling, general and administrative expenses | (309) | (17) |
Accumulated Postretirement Plans Adjustment, Amortization of Prior Service Cost [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Cost of sales |  | 14 | 37
Selling, general and administrative expenses | $ 14 | $ 4 | $ 5

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- Definition The aggregate cost of goods produced and sold and services rendered during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + 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 The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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