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FINANCING ARRANGEMENTS - Convertible Senior and Senior Term Notes (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015 | Jul. 31, 2014
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Convertible senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount |  |  |  | $ 172,500,000.0
Interest rate percentage |  |  |  | 5.00%
Senior Notes | Senior term notes - 5.75% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount |  | $ 120,000,000.0 |  |
Interest rate percentage | 0.00% | 5.75% | 5.75% |
Senior Notes | Senior term notes - 5.50% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument face amount | $ 123,000,000 | $ 123,000,000.0 |  |
Interest rate percentage | 5.50% | 5.50% | 0.00% |
Unamortized discount |  | $ 3,000,000 |  |

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