| Year Ended December 31, | ||||||||||||||
| 2017 | 2016 | 2015 | 2014 | 2013 | ||||||||||
| Earnings: | ||||||||||||||
| Net income (loss) before income taxes | 184,349 | (3,285 | ) | (20,938 | ) | 11,280 | (9,230 | ) | ||||||
| Plus: Fixed Charges | 773 | 669 | 562 | 265 | 158 | |||||||||
| Earnings, as defined | 185,122 | (2,616 | ) | (20,376 | ) | 11,545 | (9,072 | ) | ||||||
| Fixed Charges: | ||||||||||||||
Interest component of rentals(1) | 773 | 669 | 562 | 265 | 158 | |||||||||
| Total | 773 | 669 | 562 | 265 | 158 | |||||||||
| Ratio of earnings to fixed charges | 239.5x | N/A | N/A | 43.6x | N/A | |||||||||
| Deficiency in earnings to cover fixed charges | N/A | (3,285 | ) | (20,938 | ) | N/A | (9,230 | ) | ||||||
| (1) | Represents the estimated portion of operating lease rental expense that is considered by us to be a reasonable representation of interest. |
