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Stock-Based Compensation - Allocation of Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allocation of stock-based compensation |  |  |
Stock-based compensation expense | $ 39,481 | $ 25,704 | $ 17,592
Tax benefit related to stock-based compensation | 4,600 | 10,500 | 5,400
Accrued liability for cash-settled options | 6,685 |  |
Cost of sales |  |  |
Allocation of stock-based compensation |  |  |
Stock-based compensation expense | 1,127 | 703 | 597
Selling, general and administrative |  |  |
Allocation of stock-based compensation |  |  |
Stock-based compensation expense | 31,801 | 19,816 | 13,006
Accrued liability for cash-settled options | 3,100 |  |
Research and development |  |  |
Allocation of stock-based compensation |  |  |
Stock-based compensation expense | $ 6,553 | $ 5,185 | $ 3,989

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