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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	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Change in provision for income taxes				$ 2,800
R&D tax credits			$ 4,600		$ 26,133	$ 4,569	$ 2,726
Additions based on tax positions related to prior years	$ 26,400	$ 7,300			26,858	7,473	2,726
Net operating loss carryforwards							2,225
179D deduction						2,200
Reduced provision for income taxes		8,300			8,301
Provision for income taxes					$ 41,401	$ 37,418	$ 35,773
Internal Revenue Service (IRS)
Income Taxes
Refund claims allowed in Income tax examination		8,900
Tax Year 2016
Income Taxes
Provision for income taxes	6,100
Tax Year 2017
Income Taxes
Provision for income taxes	8,500
Tax Year 2018
Income Taxes
Provision for income taxes	11,900
Total Tax Years 2016-2018
Income Taxes
Provision for income taxes	$ 26,500
179D Deduction
Income Taxes
Reduced provision for income taxes		$ 1,000

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