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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Supplemental Cash Flow Information [Abstract] |  |  |
Cash paid for interest | $ 447 | $ 180 | $ 559
Cash paid for income taxes, net of refunds | 8,754 | 20,499 | 28,004
Non-cash transactions: |  |  |
Change in accounts payable related to capital expenditures | 1,658 | (3,534) | (3,479)
Insurance premium financed by note payable | 0 | 7,630 | 0
Value of shares issued for Blackhawk Group acquisition | $ 144,047 | $ 0 | $ 0

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