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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data | The following tabulation shows certain quarterly financial data for 2019 and 2018 (in thousands, except per share amounts):
| Quarter |  |  |  |  |  |
2019 | 1 |  |  | 2 |  |  | 3 |  |  | 4 |
Service revenues | $ | 1,468,530 |  |  | $ | 1,516,385 |  |  | $ | 1,552,132 |  |  | $ | 1,537,385 |
Gross margin | $ | 607,588 |  |  | $ | 637,541 |  |  | $ | 646,446 |  |  | $ | 638,944 |
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 |
| Quarter |  |  |  |  |  |
2018 | 1 |  |  | 2 |  |  | 3 |  |  | 4 |
Service revenues | $ | 1,395,333 |  |  | $ | 1,457,054 |  |  | $ | 1,466,226 |  |  | $ | 1,481,658 |
Gross margin | $ | 572,366 |  |  | $ | 607,118 |  |  | $ | 610,468 |  |  | $ | 620,062 |
Income before income taxes | $ | 134,639 |  |  | $ | 150,075 |  |  | $ | 151,905 |  |  | $ | 154,983 |
Net income | $ | 96,167 |  |  | $ | 109,315 |  |  | $ | 115,242 |  |  | $ | 113,564 |
Basic net income per share | $ | .79 |  |  | $ | .90 |  |  | $ | .96 |  |  | $ | .96 |
Diluted net income per share | $ | .78 |  |  | $ | .89 |  |  | $ | .95 |  |  | $ | .95 |

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- References No definition available. + Details
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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118952077&loc=d3e1280-108306 + Details
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