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FINANCING ARRANGEMENTS - Schedule of Senior Term Notes (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Net carrying amount of Senior Term Notes | $ 120,435,000 |  | $ 120,002,000
Senior Notes | Senior term notes - 5.50% |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount on the Senior Term Notes | 123,000,000 | $ 123,000,000.0 |
Unamortized debt discount | (2,565,000) |  |
Net carrying amount of Senior Term Notes | $ 120,435,000 |  | $ 0

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