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Consolidated Statements Of Income - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Consolidated Statements Of Income [Abstract]    
Service revenues and sales $ 560,157 $ 530,549
Cost of services provided and goods sold (excluding depreciation) 370,705 336,552
Selling, general and administrative expenses 100,095 89,954
Depreciation 12,286 12,138
Amortization 2,513 2,518
Other operating expense 1,739 13
Total costs and expenses 487,338 441,175
Income from operations 72,819 89,374
Interest expense (1,551) (810)
Other expense - net (103) (3,862)
Income before income taxes 71,165 84,702
Income taxes (17,044) (20,533)
Net income $ 54,121 $ 64,169
Earnings Per Share:    
Net income $ 3.62 $ 4.28
Average number of shares outstanding 14,966 14,986
Diluted Earnings Per Share:    
Net income $ 3.58 $ 4.22
Average number of shares outstanding 15,110 15,192
Cash Dividends Per Share $ 0.38 $ 0.36