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Quarterly Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Interim Period, Costs Not Allocable [Line Items]                      
Net sales $ 532,789 $ 454,890 $ 456,332 $ 451,899 $ 192,473 $ 137,245 $ 116,314 $ 104,739 $ 1,895,910 $ 550,771 $ 437,963
Gross profit 318,430 274,610 290,422 306,750 59,789 16,762 9,880 1,286 1,190,212 87,717 (30,239)
Research and development (601) (518) (581) (429) (373) (1,329) (933) (820) (2,129) (3,456) (2,534)
Selling and administrative expenses 15,683 14,234 16,239 15,876 15,389 13,293 12,169 11,656 62,032 52,506 58,515
Other expense (income), net 828 1,502 (974) 2,005 (6,426) (404) 1,423 3,304 3,361 (2,104) (4,266)
Related party Tax Receivable Agreement Expense 24,677   61,801                
Net income (loss) $ 229,632 $ 199,466 $ 201,448 $ 223,673 $ 55,628 $ (3,919) $ (17,383) $ (26,344) $ 854,219 $ 7,983 $ (235,843)
Income (Loss) from Continuing Operations, Per Basic Share $ 790 $ 670 $ 670 $ 740 $ 180 $ (10) $ (60) $ (90) $ 2.87 $ 0.05 $ (0.36)
As Reported                      
Interim Period, Costs Not Allocable [Line Items]                      
Net sales $ 532,789 $ 454,890 $ 456,332 $ 451,899 $ 192,473 $ 137,245 $ 116,314 $ 104,739      
Gross profit 318,430 274,610 290,422 306,750 60,598 16,561 9,679 1,085      
Research and development (601) (518) (581) (429) (159) (1,338) (943) (829)   $ (2,951) $ (2,399)
Selling and administrative expenses 15,683 14,234 16,239 15,876 12,280 13,322 12,195 11,683   49,479 57,784
Other expense (income), net 828 1,502 (974) 2,005 (1,976) (643) 1,186 3,067   1,634 (2,188)
Related party Tax Receivable Agreement Expense 24,677   61,801                
Net income (loss) $ 229,632 $ 199,466 $ 201,448 $ 223,673 $ 55,628 $ (3,919) $ (17,383) $ (26,344)      
Income (Loss) from Continuing Operations, Per Basic Share $ 790 $ 670 $ 670 $ 740 $ 180 $ (10) $ (60) $ (90)      
Effect of Accounting Change                      
Interim Period, Costs Not Allocable [Line Items]                      
Gross profit         $ (809) $ 201 $ 201 $ 201      
Research and development         (532) 9 10 9   (505) (135)
Selling and administrative expenses         3,109 (29) (26) (27)   3,027 731
Other expense (income), net         $ (4,450) $ 239 $ 237 $ 237   $ (3,738) $ (2,078)