Condensed Consolidated Statements of Stockholders' Equity (Parenthetical)	Jun. 30, 2021	Mar. 31, 2021	Jan. 31, 2021	Jan. 07, 2021	Jan. 01, 2021	Dec. 31, 2020	Jun. 30, 2020	May 31, 2020	May 29, 2020	May 18, 2020	Mar. 31, 2018
Interest rate (as a percent)					3.75%
5.5% Convertible Senior Notes
Interest rate (as a percent)	5.50%		5.50%	5.50%		5.50%	5.50%	5.50%		5.50%	5.50%
3.75% Convertible Senior Notes
Interest rate (as a percent)	3.75%	3.75%						3.75%	3.75%	3.75%