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Acquisitions (Schedule Of Business Acquisitions Pro Forma Of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Acquisitions [Abstract] |  |  |  |
Service revenues and sales | $ 500,108 | $ 472,090 | $ 1,479,859 | $ 1,420,535
Net income | $ 62,154 | $ 56,408 | $ 164,562 | $ 166,640
Earnings per share | $ 3.89 | $ 3.51 | $ 10.32 | $ 10.37
Diluted earnings per share | $ 3.75 | $ 3.36 | $ 9.96 | $ 9.90

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