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Operating expenses (Schedule of Selling, General and Administrative Expenses) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Operating expenses        
Wages, salaries and benefits $ 80,532 $ 64,810 $ 242,319 $ 209,699
Share-based compensation expense 8,806 5,627 27,833 16,945
Buildings, facilities and technology expenses 22,176 18,213 65,588 53,035
Travel, advertising and promotion expenses 9,528 6,541 26,894 18,527
Professional fees 6,946 6,323 24,309 16,557
Other SG&A expenses 5,205 4,994 17,134 15,544
Total selling, general and administrative expenses $ 133,193 $ 106,508 $ 404,077 $ 330,307