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FINANCING ARRANGEMENTS - Convertible Senior and Senior Term Notes (Details) - USD ($) | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Unamortized discount | $ 1,800,000 |  |
Senior Notes | Senior term notes - 5.75% |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument face amount |  |  | $ 120,000,000.0
Interest rate percentage |  |  | 5.75%
Senior Notes | Senior Term Notes 5.5% |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument face amount |  |  | $ 123,000,000.0
Interest rate percentage | 5.50% | 5.50% | 5.50%
Unamortized discount | $ 1,815,000 | $ 2,565,000 | $ 3,000,000

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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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