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Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Supplemental Cash Flow Information [Abstract] |  |  |
Cash paid for interest | $ 296 | $ 447 | $ 180
Cash paid (received) for income taxes, net of refunds | (20,732) | 8,754 | 20,499
Non-cash transactions: |  |  |
Change in accounts payable related to capital expenditures | 5,761 | 1,658 | (3,534)
Insurance premium financed by note payable | 5,125 | 0 | 7,630
Net transfers from inventory to property, plant and equipment | 4,689 | 0 | 0
Value of shares issued for Blackhawk Group acquisition | 0 | 144,047 | 0
Conversion of Preferred Stock | 0 | 55,941 | 0
TRA liability | 0 | 124,531 | 0
Deferred tax impact of TRA | $ 0 | $ 68,590 | $ 0

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