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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | $ 31,389 | $ 48,138 | $ 49,364
Charged to Costs and Expenses | 81,180 | 76,115 | 88,110
Deductions (1) | (92,092) | (92,864) | (89,336)
Balance at End of Period | 20,477 | 31,389 | 48,138
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 18,325 | 32,856 | 36,368
Charged to Costs and Expenses | 711 | 1,235 | 6,079
Deductions (1) | (8,077) | (15,766) | (9,591)
Balance at End of Period | 10,959 | 18,325 | 32,856
Reserve for sales returns and allowances |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 4,983 | 6,121 | 4,639
Charged to Costs and Expenses | 71,865 | 65,562 | 72,995
Deductions (1) | (74,107) | (66,700) | (71,513)
Balance at End of Period | 2,741 | 4,983 | 6,121
Reserve for unapplied rebates |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at Beginning of Period | 8,081 | 9,161 | 8,357
Charged to Costs and Expenses | 8,604 | 9,318 | 9,036
Deductions (1) | (9,908) | (10,398) | (8,232)
Balance at End of Period | $ 6,777 | $ 8,081 | $ 9,161

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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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- Definition Amount of decrease in valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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