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DEBT (Tables) | 6 Months Ended
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Jun. 30, 2018
Debt Disclosure [Abstract] |
Schedule of composition of the Company's debt and financing obligations | The total debt composition of the 2022 Notes is as follows (in thousands):
| June 30, |  | December 31,
| 2018 |  | 2017
2.375% convertible senior notes due 2022 | $ | 345,000 |  |  | $ | 345,000 |
Deferred financing costs | (6,675 | ) |  | (7,482 | )
Discount on debt | (55,067 | ) |  | (61,345 | )
Total debt, net of debt discount and deferred financing costs | $ | 283,258 |  |  | $ | 276,173 |
Schedule of total interest expense recognized related to the Notes | The following table sets forth the total interest expense recognized in the periods presented (dollar amounts in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Contractual interest expense | $ | 2,051 |  |  | $ | 2,053 |  |  | $ | 4,102 |  |  | $ | 3,242 |
Amortization of debt issuance costs | 406 |  |  | 389 |  |  | 808 |  |  | 590 |
Amortization of debt discount | 3,170 |  |  | 2,951 |  |  | 6,283 |  |  | 4,362 |
Capitalized interest and other (Note 5) | (230 | ) |  | (167 | ) |  | (640 | ) |  | (379 | )
Total | $ | 5,397 |  |  | $ | 5,226 |  |  | $ | 10,553 |  |  | $ | 7,815 |
Effective interest rate on convertible senior notes | 7.81 | % |  | 7.81 | % |  | 7.81 | % |  | 7.70 | %

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