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Selected Quarterly Information (Unaudited) | 12 Months Ended
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Dec. 31, 2019
Selected Quarterly Financial Information [Abstract] |
Selected Quarterly Information (Unaudited) | Note 21 — Selected Quarterly Information (Unaudited)
|  | Three Months Ended, |
|  | March 31, 2019 |  |  | June 30, 2019 |  |  | September 30, 2019 |  |  | December 31, 2019 |
Product revenues |  | $ | 257,921 |  |  | $ | 243,326 |  |  | $ | 240,056 |  |  | $ | 230,381 |
Gross margin |  |  | 75,307 |  |  |  | 72,714 |  |  |  | 74,692 |  |  |  | 65,622 |
Net income |  |  | 8,414 |  |  |  | 2,751 |  |  |  | 15,887 |  |  |  | 10,454 |
Basic earnings per share |  | $ | 0.25 |  |  | $ | 0.08 |  |  | $ | 0.48 |  |  | $ | 0.32 |
Diluted earnings per share |  | $ | 0.25 |  |  | $ | 0.08 |  |  | $ | 0.48 |  |  | $ | 0.32 |
|  | Three Months Ended, |
|  | March 31, 2018 |  |  | June 30, 2018 |  |  | September 30, 2018 |  |  | December 31, 2018 |
Product revenues (a) |  | $ | 264,586 |  |  | $ | 266,400 |  |  | $ | 261,504 |  |  | $ | 256,015 |
Gross margin |  |  | 81,242 |  |  |  | 77,092 |  |  |  | 75,704 |  |  |  | 70,820 |
Net income (loss) |  |  | 12,966 |  |  |  | 16,659 |  |  |  | (355 | ) |  |  | 12,629 |
Basic earnings (loss) per share |  | $ | 0.35 |  |  | $ | 0.46 |  |  | $ | (0.01 | ) |  | $ | 0.37 |
Diluted earnings (loss) per share |  | $ | 0.35 |  |  | $ | 0.45 |  |  | $ | (0.01 | ) |  | $ | 0.36 |
| a) | Product revenues for 2018 have been adjusted to conform with the current year presentation, related to a reclassification of customer relationship amortization from product revenues to selling, general and administrative expenses. See Note 2, “Significant Accounting Policies” to the consolidated financial statements included in this Report for further details regarding these adjustments.

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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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