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Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Maximum net exposure to counterparty |  |  |  |  |  |  |  |  | $ 947 |  |
Sales | $ 52,677 | $ 45,774 | $ 30,680 | $ 41,556 | $ 41,399 | $ 39,441 | $ 29,142 | $ 38,207 | 170,687 | $ 148,189 | $ 155,266
Other, net |  |  |  |  |  |  |  |  | 343 | 533 | $ 434
Reclassification Out Of Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | (450) | (351) |
Other, net |  |  |  |  |  |  |  |  |  | $ (42) |
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized Gains (Losses) on Cash Flow Hedges [Member] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | $ (450) |  |

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- Definition Amount of income (expense) related to nonoperating activities, classified as other. + 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 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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