Share-Based Employee Compensation - Amounts Recognized for Share-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Cost of employee share-based compensation included in income, before income tax	$ 3,272	$ 2,513	$ 8,066	$ 9,478
Cost of sales
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Cost of employee share-based compensation included in income, before income tax	158	213	553	715
Operating expenses
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Cost of employee share-based compensation included in income, before income tax	$ 3,114	$ 2,300	$ 7,513	$ 8,763