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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Supplemental disclosure: |  |  |  |
Interest paid | $ 0 | $ 0 | $ 0 | $ 0
Income taxes paid | 10,329 | 6,643 | 10,847 | 10,846
Non-cash investing and financing activities: |  |  |  |
Non-cash capital expenditures | 1,047 | (102) | 1,312 | (173)
Dividends declared | $ 5,834 | $ 5,982 | $ 5,834 | $ 5,982

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