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DEBT - Convertible Subordinated Notes (Details) - Convertible subordinated notes $ / shares in Units, $ in Millions |  | 1 Months Ended |
--- | --- | --- | ---
Jul. 31, 2014 $ / shares $ / Item | Jul. 31, 2014 $ / shares $ / Item shares | Jan. 31, 2013 USD ($) Item $ / shares $ / Item shares | Dec. 31, 2016 USD ($)
Privately-negotiated capped call option |  |  |  |
Debt |  |  |  |
Cap price for the underlying number of shares (in dollars per share) | $ / Item | 27.04 | 27.04 |  |
2023 Notes |  |  |  |
Debt |  |  |  |
Loan amount |  |  | $ 287.5 |
Proceeds from issuance of notes payable, net of debt issuance costs |  |  | $ 281.2 |
Interest rate (as a percent) |  |  | 2.125% |
Initial conversion, shares per $1,000 principal amount | shares | shares |  |  | 35.9903 |
Adjusted conversion, shares per $1,000 principal amount | shares |  | 50.5818 |  |
Conversion price of convertible notes into common stock (in dollars per share) | $ / shares | $ 19.77 | $ 19.77 | $ 27.79 |
Portion of debt retired, face value |  |  |  | $ 14.1
Portion of debt retired, carrying value |  |  |  | $ 13.9
2023 Notes | Privately-negotiated capped call option |  |  |  |
Debt |  |  |  |
Payments for capped call options |  |  | $ 36.8 |
Number of derivative instruments purchased | Item |  |  | 2 |
Strike price for the underlying number of shares (in dollars per share) | $ / shares | $ 27.79 | $ 19.77 | $ 27.79 |
Cap price for the underlying number of shares (in dollars per share) | $ / Item | 38.00 | 38.00 | 38.00 |
2023 Notes | Stock prices below $27.79 per share | Minimum |  |  |  |
Debt |  |  |  |
Net shares settlement payable to the entity | shares |  |  | 0 |
2023 Notes | Stock prices above $38.00 per share | Maximum |  |  |  |
Debt |  |  |  |
Net shares settlement payable to the entity | shares |  |  | 2,779,659 |

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