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Consolidated Statements Of Income Unaudited - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Consolidated Statements Of Income [Abstract]        
Service revenues and sales $ 538,667 $ 528,297 $ 1,598,283 $ 1,546,294
Cost of services provided and goods sold (excluding depreciation) 342,164 339,240 1,033,130 1,043,148
Selling, general and administrative expenses 89,217 88,317 274,654 243,413
Depreciation 11,844 11,714 37,171 34,761
Amortization 2,510 2,511 7,530 7,476
Other operating expenses/(income) 63 12,207 789 (28,935)
Total costs and expenses 445,798 453,989 1,353,274 1,299,863
Income from operations 92,869 74,308 245,009 246,431
Interest expense (583) (379) (1,343) (2,005)
Other income - net 3,134 7,675 10,521 5,723
Income before income taxes 95,420 81,604 254,187 250,149
Income taxes (23,417) (13,882) (60,262) (44,435)
Net income $ 72,003 $ 67,722 $ 193,925 $ 205,714
Earnings Per Share:        
Net income $ 4.62 $ 4.25 $ 12.27 $ 12.90
Average number of shares outstanding 15,587 15,940 15,808 15,948
Diluted Earnings Per Share:        
Net income $ 4.55 $ 4.14 $ 12.06 $ 12.53
Average number of shares outstanding 15,842 16,373 16,083 16,419
Cash Dividends Per Share $ 0.36 $ 0.34 $ 1.04 $ 0.98