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Significant Accounting Policies (Details) $ / shares in Units, shares in Thousands | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) plan | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) plan | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 11, 2020 USD ($) | Jan. 01, 2019 USD ($) | Nov. 06, 2017 USD ($)
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized for repurchase |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000 |  |
Shares repurchased during the period (shares) | shares |  |  |  |  | 760 |  |  |  |  |  |  |  |  |  |
Weighted average share price of shares repurchased (per share) | $ / shares |  |  |  |  | $ 25.40 |  |  |  |  |  |  |  |  |  |
Total purchase price | [1] |  |  |  |  |  |  |  |  | $ (19,300,000) |  |  |  |  |
Shares available for repurchase |  | $ 55,700,000 |  |  |  |  |  |  |  | 55,700,000 |  |  |  |  |
Sales |  | $ 312,400,000 | $ 273,200,000 | $ 289,600,000 | $ 301,900,000 | $ 321,400,000 | $ 338,000,000.0 | $ 287,100,000 | $ 269,000,000.0 | 1,177,100,000 | $ 1,215,500,000 | $ 1,003,900,000 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | 845,000,000.0 | 918,000,000.0 | 744,800,000 |  |  |
Advertising costs |  |  |  |  |  |  |  |  |  | 2,700,000 | 4,000,000.0 | 3,700,000 |  |  |
Research and development expense |  |  |  |  |  |  |  |  |  | $ 9,100,000 | 9,200,000 | 8,700,000 |  |  |
Number of pension plans (plans) | plan |  | 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |
Right of use assets |  | $ 29,000,000.0 |  |  |  | 34,000,000.0 |  |  |  | $ 29,000,000.0 | 34,000,000.0 |  |  | $ 34,800,000 |
Operating lease liability |  | 28,700,000 |  |  |  | 34,100,000 |  |  |  | 28,700,000 | 34,100,000 |  |  | $ 34,800,000 |
Convertible Notes, due 2024 | Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 258,800,000 |  |  |  | $ 258,800,000 |  |  |  | 258,800,000 | 258,800,000 |  |  |  | $ 258,800,000
Shipping |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 10,600,000 | 11,300,000 | 10,600,000 |  |  |
Cost of sales |  |  |  |  |  |  |  |  |  | $ 15,000,000.0 | $ 15,800,000 | $ 15,200,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible asset useful life |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible asset useful life |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |
[1] | Includes $19.3 in shares repurchased through our share repurchase program. Refer to Note 2, “Significant Accounting Policies,” for further information.

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