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Acquisitions (Schedule Of Business Acquisitions Pro Forma Of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Acquisitions [Abstract] |  |  |  |
Service revenues and sales | $ 502,389 | $ 495,847 | $ 1,018,377 | $ 980,143
Net income | $ 82,133 | $ 54,491 | $ 138,050 | $ 102,475
Earnings per share | $ 5.16 | $ 3.42 | $ 8.65 | $ 6.43
Diluted earnings per share | $ 5.02 | $ 3.31 | $ 8.39 | $ 6.21

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