Income Taxes - Provision For Income Tax Rate To Statutory Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent [Abstract]
(Benefit) provision at statutory rate	$ (3,303,000)	$ 117,057,000	$ 144,192,000
State taxes, net of federal benefit	822,000	14,165,000	18,086,000
Foreign rate differential	60,000	1,665,000	2,712,000
Foreign derived intangible income	0	(3,108,000)	(8,400,000)
Research and development credit	(8,442,000)	(8,200,000)	(7,400,000)
Unrecognized tax benefits including interest and penalties	(8,567,000)	289,000	(4,121,000)
Valuation allowance adjustments	9,675,000	8,070,000	908,000
State credits	(13,106,000)	(4,704,000)	0
Income tax expense	0	0	(8,098,000)
Territorial tax	0	0	9,556,000
Global intangible low-taxed income	1,480,000	1,113,000	2,437,000
Adjustments for previously accrued taxes	(4,951,000)	(1,755,000)	(7,196,000)
Rate differential on intercompany transfers	0	0	6,013,000
Executive compensation limitation	2,543,000	2,620,000	3,171,000
Other foreign inclusions	4,415,000	4,202,000	1,787,000
Other	2,346,000	2,366,000	1,531,000
Total Current and Deferred	$ (17,028,000)	$ 133,780,000	$ 155,178,000