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Supplemental Cash Flow Information (Tables) | 12 Months Ended
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Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract] |
Supplemental Cash Flow Information |
| Years Ending December 31,
| 2014 |  | 2013 |  | 2012
Supplemental disclosures: | (in thousands)
Interest paid | $ | — |  |  | $ | 1 |  |  | $ | 44 |
Income taxes paid, net | 26,456 |  |  | 19,884 |  |  | 15,128 |
Non-cash investing and financing activities: |  |  |  |  |
Non-cash capital expenditures | (79 | ) |  | 71 |  |  | (3,670 | )
Trade-in of equipment | — |  |  | 315 |  |  | 300 |

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