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Consolidated Statements Of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Consolidated Statements Of Income [Abstract]        
Service revenues and sales $ 564,532 $ 526,472 $ 1,678,505 $ 1,588,309
Cost of services provided and goods sold (excluding depreciation) 362,358 346,934 1,107,256 1,020,307
Selling, general and administrative expenses 99,602 83,992 294,684 261,799
Depreciation 12,858 12,154 37,778 37,006
Amortization 2,521 2,520 7,548 7,558
Other operating expense/(income) 343 15 2,064 (530)
Total costs and expenses 477,682 445,615 1,449,330 1,326,140
Income from operations 86,850 80,857 229,175 262,169
Interest expense (444) (1,271) (2,766) (2,983)
Other income/(expense) - net 6,859 (3,115) 8,365 (11,907)
Income before income taxes 93,265 76,471 234,774 247,279
Income taxes (18,307) (19,598) (52,318) (59,781)
Net income $ 74,958 $ 56,873 $ 182,456 $ 187,498
Earnings Per Share:        
Net income $ 4.97 $ 3.82 $ 12.14 $ 12.55
Average number of shares outstanding 15,075 14,888 15,034 14,935
Diluted Earnings Per Share:        
Net income $ 4.93 $ 3.78 $ 12.02 $ 12.41
Average number of shares outstanding 15,200 15,042 15,178 15,114
Cash Dividends Per Share $ 0.40 $ 0.38 $ 1.16 $ 1.10