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Consolidated Statements Of Stockholders' Equity (Parenthetical) - Convertible Notes [Member]
Dec. 31, 2021
May 18, 2021
Dec. 31, 2020
Dec. 31, 2019
Jun. 30, 2019
3.25% Convertible Notes Due 2018 [Member]          
Interest rate, stated percentage       4.00%  
3.25% Convertible Notes Due 2019 [Member]          
Interest rate, stated percentage       3.25%  
4.00% Convertible Notes Due 2024 [Member]          
Interest rate, stated percentage     4.00%    
Corporate Activities [Member] | 4.00% Convertible Notes Due 2024 [Member]          
Interest rate, stated percentage 4.00% 4.00%   4.00% 4.00%