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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Supplemental disclosure: |  |  |  |
Interest paid | $ 0 | $ 0 | $ 0 | $ 0
Income taxes paid | 8,551 | 6,321 | 19,398 | 17,167
Non-cash investing and financing activities: |  |  |  |
Non-cash capital expenditures | $ (1,211) | $ (17) | $ 101 | $ (190)

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