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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