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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information |
| Years Ending December 31,
| 2017 |  | 2016 |  | 2015
Supplemental disclosures: | (in thousands)
Interest paid | $ | — |  |  | $ | — |  |  | $ | — |
Income taxes paid, net | 16,951 |  |  | 27,353 |  |  | 24,125 |
Non-cash investing and financing activities: |  |  |  |  |
Non-cash capital expenditures | 832 |  |  | 270 |  |  | 83 |

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