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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) | Jun. 30, 2019 | Apr. 23, 2018 | Oct. 05, 2016
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Senior Unsecured Convertible Bonds Due 2018 [Member] |  |  |
Interest rate |  |  | 3.25%
Senior Unsecured Convertible Bonds due 2023 [Member] |  |  |
Interest rate | 4.875% | 4.875% | 4.875%

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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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