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DEBT - Convertible Subordinated Notes (Details) - 2023 Notes - Convertible subordinated notes $ / shares in Units, $ in Millions | 1 Months Ended | 12 Months Ended
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Jan. 31, 2013 USD ($) item $ / shares $ / item shares | Dec. 31, 2016 USD ($) $ / shares $ / item shares
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 | $ 27.79 | $ 19.77
Portion of debt retired, face value |  | $ 14.1
Portion of debt retired, carrying value |  | $ 13.9
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
Cap price for the underlying number of shares (in dollars per share) | $ / item | 38.00 | 27.04
Stock prices below $27.79 per share | Minimum |  |
Debt |  |
Net shares settlement payable to the entity | shares | 0 |
Stock prices above $38.00 per share | Maximum |  |
Debt |  |
Net shares settlement payable to the entity | shares | 2,779,659 |

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