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Revenue Recognition Impact of ASC 606 on Consolidated Statements of Operations and Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Sales Revenue, Goods, Net | $ 310,204 | $ 305,907
Sales Revenue, Services, Net | 39,433 | 0
Net sales | 349,637 | 305,907
Cost of Goods Sold | 145,493 | 122,889
Cost of Services | 14,604 | 0
Cost of Goods and Services Sold | 160,097 |
Gross Profit | $ 189,540 | 183,018
Gross Profit, Percentage | 54.20% |
Selling Expense | $ 87,642 | 98,025
General and Administrative Expense | 92,688 | 80,479
Operating Expenses | 180,330 | $ 173,082
Calculated under Revenue Guidance in Effect before Topic 606 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Sales Revenue, Goods, Net | 349,587 |
Sales Revenue, Services, Net | 0 |
Net sales | 349,587 |
Cost of Goods Sold | 145,493 |
Cost of Services | 0 |
Cost of Goods and Services Sold | 145,493 |
Gross Profit | $ 204,094 |
Gross Profit, Percentage | 58.40% |
Selling Expense | $ 102,140 |
General and Administrative Expense | 92,688 |
Operating Expenses | 194,828 |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Sales Revenue, Goods, Net | 39,383 |
Sales Revenue, Services, Net | (39,433) |
Net sales | (50) |
Cost of Goods Sold | 0 |
Cost of Services | (14,604) |
Cost of Goods and Services Sold | (14,604) |
Gross Profit | 14,554 |
Selling Expense | 14,498 |
General and Administrative Expense | 0 |
Operating Expenses | $ 14,498 |

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- Definition The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities. + 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(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total costs related to goods produced and sold 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(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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