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QUARTERLY FINANCIAL INFORMATION (UNAUDITED) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
QUARTERLY FINANCIAL INFORMATION (UNAUDITED) | QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (In thousands, except per share data)
|  | 2020 |  | 2019
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter
Net sales |  | $ | 174,436 |  |  | $ | 173,355 |  |  | $ | 175,140 |  |  | $ | 180,713 |  |  | $ | 157,029 |  |  | $ | 161,554 |  |  | $ | 158,595 |  |  | $ | 166,527 |
Gross margin |  | 55,331 |  |  | 55,380 |  |  | 56,368 |  |  | 56,818 |  |  | 49,095 |  |  | 53,918 |  |  | 54,008 |  |  | 54,346 |
Earnings before income taxes |  | 24,490 |  |  | 25,973 |  |  | 27,907 |  |  | 28,047 |  |  | 24,793 |  |  | 24,881 |  |  | 24,436 |  |  | 22,368 |
Net earnings |  | 19,768 |  |  | 21,125 |  |  | 21,568 |  |  | 22,162 |  |  | 18,783 |  |  | 19,829 |  |  | 20,676 |  |  | 20,383 |
Basic net earnings per common share |  | $ | .62 |  |  | $ | .66 |  |  | $ | .67 |  |  | $ | .69 |  |  | $ | .58 |  |  | $ | .62 |  |  | $ | .64 |  |  | $ | .64 |
Diluted net earnings per common share |  | $ | .61 |  |  | $ | .65 |  |  | $ | .66 |  |  | $ | .68 |  |  | $ | .58 |  |  | $ | .61 |  |  | $ | .64 |  |  | $ | .63 |

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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