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Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenue Recognition [Abstract] |  |  |
Revenue | $ 2,420,416 | $ 2,679,008 | $ 2,279,099
Revenue Recognition [Abstract] |  |  |
Sales returns | 52,200 | 52,000 | 53,800
ASC Topic 606 [Member] |  |  |
Revenue Recognition [Abstract] |  |  |
Cumulative impact on opening retained earnings |  |  | $ 13,000
Allowance for Product Returns [Member] |  |  |
Revenue Recognition [Abstract] |  |  |
Accrued reserve | 3,900 | 3,600 |
Impact of Adopting ASC Topic 606 [Member] | ASC Topic 606 [Member] |  |  |
Revenue Recognition [Abstract] |  |  |
Revenue | $ 1,300 | $ 1,100 |

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