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Unaudited Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2020
Unaudited Quarterly Financial Data [Abstract] |
Unaudited Quarterly Financial Data | 15. Unaudited Quarterly Financial Data The following is a summary of quarterly results of operations:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Quarter ended
2020 |  | December 31 |  | September 30 |  | June 30 |  | March 31
Net sales | ​ | $ | 189,731 | ​ | $ | 175,764 | ​ | $ | 99,545 | ​ | $ | 182,966
Gross profit | ​ | ​ | 49,550 | ​ | ​ | 45,995 | ​ | ​ | 13,254 | ​ | ​ | 45,397
Operating income (loss) | ​ | ​ | 5,673 | ​ | ​ | 9,827 | ​ | ​ | (26,823) | ​ | ​ | 3,659
Income tax expense (benefit) | ​ | ​ | 920 | ​ | ​ | 1,814 | ​ | ​ | (6,721) | ​ | ​ | 1,213
Net income (loss) | ​ | ​ | 3,580 | ​ | ​ | 6,714 | ​ | ​ | (21,734) | ​ | ​ | 3,490
Earnings (loss) per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic (A) | ​ | $ | 0.13 | ​ | $ | 0.25 | ​ | $ | (0.81) | ​ | $ | 0.13
Diluted (A) | ​ | $ | 0.13 | ​ | $ | 0.25 | ​ | $ | (0.81) | ​ | $ | 0.13
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​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Quarter ended
2019 |  | December 31 |  | September 30 |  | June 30 (B) |  | March 31
Net sales | ​ | $ | 190,365 | ​ | $ | 203,386 | ​ | $ | 222,241 | ​ | $ | 218,297
Gross profit | ​ | ​ | 44,198 | ​ | ​ | 51,855 | ​ | ​ | 56,827 | ​ | ​ | 60,853
Operating income | ​ | ​ | 1,073 | ​ | ​ | 9,323 | ​ | ​ | 49,186 | ​ | ​ | 11,699
Income tax (benefit) expense | ​ | ​ | (4,249) | ​ | ​ | 1,450 | ​ | ​ | 9,066 | ​ | ​ | 1,835
Net income | ​ | ​ | 4,209 | ​ | ​ | 6,661 | ​ | ​ | 39,764 | ​ | ​ | 9,657
Earnings per share: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic (A) | ​ | $ | 0.15 | ​ | $ | 0.24 | ​ | $ | 1.43 | ​ | $ | 0.34
Diluted (A) | ​ | $ | 0.15 | ​ | $ | 0.24 | ​ | $ | 1.41 | ​ | $ | 0.33
(A) | Earnings per share for the year may not equal the sum of the four historical quarters earnings per share due to changes in weighted-average basic and diluted shares outstanding.
(B) | The Company recognized a gain on disposal of Non-core Products in our Control Devices segment, net of $33,599 in the quarter ended June 30, 2019. See Note 2 to the Company’s consolidated financial statements for further information.

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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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