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DEBT - Convertible Subordinated Notes (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2013 USD ($) item $ / shares $ / item shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) $ / shares $ / item shares
Debt |  |  |  |
Settlement amount for purchase of notes |  | $ 0 | $ 11,570 | $ 0
Amount received from capped call option |  | $ 0 | 578 | $ 0
2023 Notes | Convertible subordinated notes |  |  |  |
Debt |  |  |  |
Loan amount | $ 287,500 |  |  |
Proceeds from issuance of notes payable, net of debt issuance costs | $ 281,200 |  |  |
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 |  |  | 14,100 |
Portion of debt retired, carrying value |  |  | 13,900 |
Settlement amount for purchase of notes |  |  | 11,600 |
2023 Notes | Convertible subordinated notes | Other (expense) income |  |  |  |
Debt |  |  |  |
Gain (Loss) on Repurchase of Debt Instrument |  |  | 2,300 |
2023 Notes | Convertible subordinated notes | Privately-negotiated capped call option |  |  |  |
Debt |  |  |  |
Payments for capped call options | $ 36,800 |  |  |
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
Amount received from capped call option |  |  | $ 600 |
2023 Notes | Convertible subordinated notes | Stock prices below $27.79 per share | Minimum |  |  |  |
Debt |  |  |  |
Net shares settlement payable to the entity | shares | 0 |  |  |
2023 Notes | Convertible subordinated 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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