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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Supplemental disclosures: |  |  |
Interest paid | $ 6 | $ 0 | $ 0
Income taxes paid, net | 14,979 | 16,951 | 27,353
Non-cash investing and financing activities: |  |  |
Non-cash capital expenditures | $ 481 | $ 832 | $ 270

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