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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
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