Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Jun. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2018	May 31, 2020	May 29, 2020	May 18, 2020	Dec. 31, 2019	Mar. 31, 2018
Deferred income tax benefit	$ (6,644)	$ (17,371)	$ (17,371)	$ (24,015)	$ (30,845)	$ (9,295)
DTAs recorded					242,334					$ 151,959
Future taxable income attributable to the net credit to additional paid-in capital					$ 25,600
Interest rate (as a percent)							3.50%
3.75% Convertible Senior Notes
Interest rate (as a percent)					3.75%		3.75%	3.75%	3.75%
5.5% Convertible Senior Notes
Interest rate (as a percent)					5.50%		5.50%		5.50%		5.50%
Giner ELX, Inc
Income tax benefit related to deferred taxes					$ 5,200