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Summary of Significant Accounting Policies, Inventories (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Inventories [Abstract] |  |  |
Raw materials | $ 87,683 | $ 108,276 |
Finished goods | 165,771 | 141,660 |
Inventories | 253,454 | 249,936 |
Inventory Valuation Reserve [Member] |  |  |
Valuation Allowance [Roll Forward] |  |  |
Beginning balance | 7,995 | 20,744 | $ 56,034
Additions | 16,382 | 24,906 | 38,605
Write-offs | (16,296) | (37,655) | (73,895)
Ending balance | $ 8,081 | $ 7,995 | $ 20,744

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- Definition Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount before valuation and LIFO reserves of raw materials expected to be sold, or consumed within one year or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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