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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) Website shares | Dec. 31, 2017 USD ($) Website shares | Dec. 31, 2016 USD ($) shares
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Number of E-Commerce Websites | Website | 7 | 4 |
Available-for-sale Securities, Gross Realized Gain (Loss) | $ 189,000 | $ (5,000) | $ 661,000
Goodwill, Impairment Loss | 0 | 1,000,000 | $ 0
Accretion (Amortization) of Discounts and Premiums, Investments | 728,000 | 983,000 |
Cash Equivalents, at Carrying Value | $ 77,050,000 | $ 58,436,000 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares | 45,000 | 14,000 | 561,000
Advertising Expense | $ 21,921,000 | $ 19,629,000 | $ 16,024,000
Shipping, Handling and Transportation Costs | $ 43,340,000 | 32,395,000 | 27,079,000
Defined Benefit Plan Matching Contribution Percentage Of Employees Contributions | 50.00% |  |
Defined Benefit Plan Maximum Percentage To Be Matched Of Employees Compensation | 6.00% |  |
Pension Cost (Reversal of Cost) | $ 1,893 | 1,819,000 | $ 1,633,000
Available-for-sale Securities, Gross Unrealized Gain (Loss) | $ 67,000 |  |
Short-term Investments [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Available-for-sale Securities, Gross Unrealized Loss |  | 106,000 |
Available-for-sale Securities, Gross Unrealized Gain |  | 1,000 |
Other Long-term Investments [Member] |  |  |
Condensed Balance Sheet Statements, Captions [Line Items] |  |  |
Available-for-sale Securities, Gross Unrealized Loss |  | 90,000 |
Available-for-sale Securities, Gross Unrealized Gain |  | $ 3,000 |

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- Definition The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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