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CONVERTIBLE SENIOR NOTES (Tables) | 9 Months Ended
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Sep. 30, 2017
Debt Disclosure [Abstract] |
Debt Net of Discount and Deferred Financing Costs | Debt, net of discounts and deferred financing costs at September 30, 2017, consisted of the following:
Principal |  | $ | 517,500 |
Deferred financing costs |  |  | (9,975 | )
Debt discount, net |  |  | (142,415 | )
Net carrying amount |  | $ | 365,110 |

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