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