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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 Cash Flow Information [Abstract] |  |  |
Cash paid for interest | $ 273 | $ 296 | $ 447
Cash paid (received) for income taxes, net of refunds | 1,848 | (20,732) | 8,754
Non-cash transactions: |  |  |
Change in accruals related to purchases of property, plant and equipment and intangibles | 5,910 | 5,761 | 1,658
Insurance premium financed by note payable | 6,798 | 5,125 | 0
Net transfers from inventory to property, plant and equipment | 4,529 | 4,689 | 0
Value of shares issued for Blackhawk Group acquisition | 0 | 0 | 144,047
Conversion of Preferred Stock | 0 | 0 | 55,941
TRA liability | 0 | 0 | 124,531
Deferred tax impact of TRA | $ 0 | $ 0 | $ 68,590

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