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Financial Instruments and Risk Concentration (Details) | Dec. 31, 2016
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2.35% senior notes due September 2016 |
Debt Instrument, Interest Rate, Stated Percentage | 2.35%
5.10% senior notes due September 2023 |
Debt Instrument, Interest Rate, Stated Percentage | 5.10%
6.15% senior notes due February 2018 |
Debt Instrument, Interest Rate, Stated Percentage | 6.15%
9.25% senior notes due January 2019 |
Debt Instrument, Interest Rate, Stated Percentage | 9.25%
5.00% senior notes due September 2020 |
Debt Instrument, Interest Rate, Stated Percentage | 5.00%
4.625% senior notes due September 2021 |
Debt Instrument, Interest Rate, Stated Percentage | 4.625%
5.50% senior notes due January 2023 |
Debt Instrument, Interest Rate, Stated Percentage | 5.50%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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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