Quarterly Financial Information |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2019 | | 2018 | | | March 31 | | June 30 | | September 30 | | December 31 | | March 31 | | June 30 | | September 30 | | December 31 | | | (Dollars in thousands, except per share amounts) | As Reported: | | | | | | | | | | | | | | | | | Net Sales | | $ | 474,994 |
| | $ | 480,390 |
| | $ | 420,797 |
| | $ | 414,612 |
| | $ | 451,899 |
| | $ | 456,332 |
| | $ | 454,890 |
| | $ | 532,789 |
| Gross profit | | 279,470 |
| | 283,343 |
| | 242,300 |
| | 235,290 |
| | 306,750 |
| | 290,422 |
| | 274,610 |
| | 318,430 |
| Research and development | | 637 |
| | 713 |
| | 611 |
| | 723 |
| | 429 |
| | 581 |
| | 518 |
| | 601 |
| Selling and administrative expenses | | 15,226 |
| | 15,394 |
| | 15,708 |
| | 17,346 |
| | 15,876 |
| | 16,239 |
| | 14,234 |
| | 15,683 |
| Other expense (income), net | | 467 |
| | 863 |
| | (688 | ) | | 4,561 |
| | 2,005 |
| | (974 | ) | | 1,502 |
| | 828 |
| Related party Tax Receivable Agreement Expense | | — |
| | — |
| | — |
| | 3,393 |
| | — |
| | 61,801 |
| | — |
| | 24,677 |
| Interest Expense | | 33,700 |
| | 32,969 |
| | 31,803 |
| | 28,859 |
| | 37,865 |
| | 28,667 |
| | 33,855 |
| | 34,674 |
| Interest Income | | (414 | ) | | (731 | ) | | (1,765 | ) | | (1,799 | ) | | (115 | ) | | (391 | ) | | (562 | ) | | (589 | ) | Net income | | 197,436 |
| | 196,368 |
| | 175,876 |
| | 174,922 |
| | 223,673 |
| | 201,448 |
| | 199,466 |
| | 229,632 |
| Net income per share | | $ | 0.68 |
| | $ | 0.68 |
| | $ | 0.61 |
| | $ | 0.61 |
| | $ | 0.74 |
| | $ | 0.67 |
| | $ | 0.67 |
| | $ | 0.79 |
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