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SENIOR AND CONVERTIBLE SENIOR NOTES, NET - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 18, 2012 | Sep. 30, 2017 | Jun. 06, 2017 | Dec. 31, 2016
Senior Notes [Member] | 5.125% senior notes due 2027 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 300.0 |
Stated interest rate |  | 5.125% | 5.125% |
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 1.875% |  | 1.875%
Debt instrument, percentage of principal amount due to note-holders | 100.00% |  |  |
Senior Notes [Member] | 1.875% convertible senior notes due 2032 [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Repurchase Amount |  | $ 51.9 |  |
Gain (Loss) on Extinguishment of Debt |  | $ 0.3 |  |

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