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Financial Instruments and Risk Concentration (Details) | Feb. 24, 2020 | Jan. 31, 2020 | Dec. 31, 2019
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5.00% senior notes due September 2020 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.00% |  | 5.00%
4.625% senior notes due September 2021 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.625% | 4.625%
Senior Notes 5.50 Percentage Due Two Zero Two Three [Member] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.50%
5.10% senior notes due September 2023 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.10% | 5.10% | 5.10%
5.75% senior notes due February 2025 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 5.75%

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- 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=6877327&loc=d3e13212-122682 + Details
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