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Stock-Based Compensation - Allocation of Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	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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- Definition

Represents the current accrued cash settled options liability.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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-Publisher FASB
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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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