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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2021
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information |
| Years Ended December 31,
| 2021 |  | 2020 |  | 2019
Supplemental disclosures: | (in thousands)
Interest paid | $ | — |  |  | $ | — |  |  | $ | — |
Income taxes paid, net | 7,891 |  |  | 13,754 |  |  | 2,172 |
Non-cash investing and financing activities: |  |  |  |  |
Non-cash capital expenditures | (3,714) |  |  | 2,843 |  |  | 863 |

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