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Summary of Unaudited Quarterly Results of Operations | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Summary of Unaudited Quarterly Results of Operations | Summary of Unaudited Quarterly Results of Operations Unaudited quarterly results of operations for the years ended December 31, 2017 and 2016 are summarized below:
| (Dollars in thousands, except per share data)
| 2017 Quarter Ended
| Dec. 31 |  | Sep. 30 |  | Jun. 30 |  | Mar. 31
Net sales | $ | 80,633 |  |  | $ | 75,651 |  |  | $ | 75,006 |  |  | $ | 74,617 |
Gross profit | $ | 46,993 |  |  | $ | 46,005 |  |  | $ | 45,141 |  |  | $ | 44,879 |
Net income | $ | 20,237 |  |  | $ | 1,321 |  |  | $ | 7,273 |  |  | $ | 857 |
Basic income per share of common stock | $ | 2.28 |  |  | $ | 0.15 |  |  | $ | 0.82 |  |  | $ | 0.10 |
Diluted income per share of common stock (1) | $ | 2.21 |  |  | $ | 0.14 |  |  | $ | 0.80 |  |  | $ | 0.09 |
| (Dollars in thousands, except per share data)
| 2016 Quarter Ended
| Dec. 31 |  | Sep. 30 |  | Jun. 30 |  | Mar. 31
Net sales | $ | 67,315 |  |  | $ | 70,199 |  |  | $ | 69,348 |  |  | $ | 69,711 |
Gross profit | $ | 40,504 |  |  | $ | 42,573 |  |  | $ | 42,526 |  |  | $ | 42,459 |
Net income (loss) | $ | (4,643 | ) |  | $ | 1,825 |  |  | $ | 172 |  |  | $ | 1,017 |
Basic income (loss) per share of common stock (1) | $ | (0.53 | ) |  | $ | 0.21 |  |  | $ | 0.02 |  |  | $ | 0.12 |
Diluted income (loss) per share of common stock (1) | $ | (0.53 | ) |  | $ | 0.20 |  |  | $ | 0.02 |  |  | $ | 0.11 |
(1) | The sum of the quarterly earnings per share amounts may not equal the total annual earnings per share due to rounding and the uneven timing of earnings throughout the year compared to the weighted average shares outstanding.

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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