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Segment Information - The Company's Net Sales by Product and Service (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net sales by product and service: |  |  |
Product sales | $ 187,591 | $ 269,731 | $ 253,041
Enrollment package revenue, freight and other | 13,676 | 25,616 | 17,623
Less: sales returns | (3,704) | (7,619) | (5,804)
Total net sales | $ 197,563 | $ 287,728 | $ 264,860

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- Definition Fees charged to customers for the delivery, generally by postal or freight service providers, of product or goods purchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 45 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=68075638&loc=d3e60635-111653 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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