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Revenue (Tables) | 12 Months Ended
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Dec. 31, 2020
Revenue |
Disaggregation of revenue | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | ​ | December 31,
​ |  | 2020 |  | 2019 |  | 2018
Sales to do-it-yourself customers | ​ | $ | 6,684,183 | ​ | $ | 5,612,390 | ​ | $ | 5,351,035
Sales to professional service provider customers |  | ​ | 4,647,189 |  | ​ | 4,369,541 |  | ​ | 4,035,898
Other sales and sales adjustments |  | ​ | 273,121 |  | ​ | 168,054 |  | ​ | 149,495
Total sales | ​ | $ | 11,604,493 | ​ | $ | 10,149,985 | ​ | $ | 9,536,428

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