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

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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