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Unaudited Quarterly Financial Data | 12 Months Ended
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Dec. 31, 2019
Unaudited Quarterly Financial Data [Abstract] |
Unaudited Quarterly Financial Data | 16. Unaudited Quarterly Financial Data The following is a summary of quarterly results of operations:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 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 expense (benefit) | ​ | ​ | (4,249) | ​ | ​ | 1,450 | ​ | ​ | 9,066 | ​ | ​ | 1,835
Net income | ​ | ​ | 4,209 | ​ | ​ | 6,661 | ​ | ​ | 39,764 | ​ | ​ | 9,657
Earnings per share attributable to Stoneridge, Inc.: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic (A) | ​ | $ | 0.15 | ​ | $ | 0.24 | ​ | $ | 1.43 | ​ | $ | 0.34
Diluted (A) | ​ | $ | 0.15 | ​ | $ | 0.24 | ​ | $ | 1.41 | ​ | $ | 0.33
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Quarter ended
2018 |  | December 31 |  | September 30 |  | June 30 |  | March 31
Net sales | ​ | $ | 210,814 | ​ | $ | 208,853 | ​ | $ | 220,602 | ​ | $ | 225,930
Gross profit | ​ | ​ | 57,959 | ​ | ​ | 63,285 | ​ | ​ | 67,418 | ​ | ​ | 67,969
Operating income | ​ | ​ | 12,664 | ​ | ​ | 18,312 | ​ | ​ | 19,181 | ​ | ​ | 16,847
Income tax expense | ​ | ​ | 690 | ​ | ​ | 3,467 | ​ | ​ | 3,820 | ​ | ​ | 3,233
Net income | ​ | ​ | 12,056 | ​ | ​ | 13,292 | ​ | ​ | 15,120 | ​ | ​ | 13,380
Earnings per share attributable to Stoneridge, Inc.: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Basic (A) | ​ | $ | 0.42 | ​ | $ | 0.47 | ​ | $ | 0.53 | ​ | $ | 0.47
Diluted (A) | ​ | $ | 0.42 | ​ | $ | 0.46 | ​ | $ | 0.52 | ​ | $ | 0.46
(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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