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Interest Costs | 9 Months Ended
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Sep. 30, 2017
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Interest Costs | 9. Interest Costs We capitalize a portion of our interest on funds borrowed during the active construction period of major capital projects. Capitalized interest is added to the cost of the underlying assets and amortized over the useful lives of the assets. The following is a summary of our interest costs for the three and nine month periods ended September 30, 2017 and 2016 (in thousands):
|  | For the Three Months |  |  | For the Nine Months |
|  | Ended September 30, |  |  | Ended September 30, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Interest costs charged to expense |  | $ | 21,936 |  |  | $ | 19,598 |  |  | $ | 65,164 |  |  | $ | 42,780 |
Amortization of deferred financing costs |  |  | 919 |  |  |  | 818 |  |  |  | 2,718 |  |  |  | 2,981 |
Accretion of debt discount on Convertible Notes |  |  | 4,945 |  |  |  | 4,432 |  |  |  | 14,438 |  |  |  | 12,940 |
Amortization of debt premium on Senior Secured Notes |  |  | (215 | ) |  |  | — |  |  |  | (566 | ) |  |  | — |
Interest expense |  |  | 27,585 |  |  |  | 24,848 |  |  |  | 81,754 |  |  |  | 58,701 |
Interest costs capitalized to property and equipment |  |  | 9 |  |  |  | 34 |  |  |  | 15 |  |  |  | 187 |
Interest costs capitalized to software |  |  | 193 |  |  |  | 279 |  |  |  | 804 |  |  |  | 961 |
Total interest costs |  | $ | 27,787 |  |  | $ | 25,161 |  |  | $ | 82,573 |  |  | $ | 59,849 |

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- Definition The entire disclosure for interest costs. + References No definition available. + Details
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Period Type: | duration