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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited) The following tabulation shows certain quarterly financial data for 2020 and 2019 (in thousands, except per share amounts):
| Quarter
2020 | One |  | Two |  | Three |  | Four
Service revenues | $ | 1,506,691 |  |  | $ | 1,108,326 |  |  | $ | 1,189,897 |  |  | $ | 1,304,086 |
Gross margin | $ | 614,388 |  |  | $ | 416,535 |  |  | $ | 467,346 |  |  | $ | 514,342 |
Income before income taxes | $ | 131,763 |  |  | $ | 58,024 |  |  | $ | 102,510 |  |  | $ | 129,585 |
Net income | $ | 89,915 |  |  | $ | 46,196 |  |  | $ | 75,749 |  |  | $ | 94,416 |
Basic net income per share | $ | .79 |  |  | $ | .41 |  |  | $ | .67 |  |  | $ | .84 |
Diluted net income per share | $ | .79 |  |  | $ | .41 |  |  | $ | .67 |  |  | $ | .84 |
| Quarter
2019 | One |  | Two |  | Three |  | Four
Service revenues | $ | 1,468,530 |  |  | $ | 1,516,385 |  |  | $ | 1,552,132 |  |  | $ | 1,537,385 |
Gross margin | $ | 605,401 |  |  | $ | 636,589 |  |  | $ | 646,278 |  |  | $ | 636,861 |
Income before income taxes | $ | 147,383 |  |  | $ | 160,103 |  |  | $ | 163,782 |  |  | $ | 154,247 |
Net income | $ | 109,798 |  |  | $ | 114,612 |  |  | $ | 117,181 |  |  | $ | 112,842 |
Basic net income per share | $ | .94 |  |  | $ | .98 |  |  | $ | 1.02 |  |  | $ | .99 |
Diluted net income per share | $ | .93 |  |  | $ | .98 |  |  | $ | 1.01 |  |  | $ | .98 |

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- References No definition available. + Details
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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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