Income Taxes - Provision Changes, Examination (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
R&D tax credits			$ 4,600		$ 26,133	$ 4,569	$ 2,700
Additions based on tax positions related to prior years		$ 7,300		$ 489	26,858	7,473
179D deduction						2,200
Reduced provision for income taxes		8,300			8,301
Provision for income taxes				$ 46,926	$ 41,401	$ 37,418
Internal Revenue Service (IRS)
Income Taxes
Refund claims allowed in Income tax examination		$ 8,900
Total Tax Years 2016-2018
Income Taxes
Additions based on tax positions related to prior years	$ 28,800
R&D Tax Credit and 179D Deduction | Tax Year 2016
Income Taxes
Provision for income taxes	9,800
R&D Tax Credit and 179D Deduction | Tax Year 2017
Income Taxes
Provision for income taxes	9,500
R&D Tax Credit and 179D Deduction | Tax Year 2018
Income Taxes
Provision for income taxes	11,900
R&D Tax Credit and 179D Deduction | Total Tax Years 2016-2018
Income Taxes
Provision for income taxes	$ 31,200