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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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