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CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Convertible Senior Notes 0.375 Percent Due 2018 |  |  |
Interest rate of debt (as a percent) | 0.375% | 0.375% | 0.375%
Convertible Senior Notes 1.25 Percent Due 2020 |  |  |
Interest rate of debt (as a percent) | 1.25% | 1.25% | 1.25%

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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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