Operating Expenses (Schedule of Selling, General and Administrative Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Expenses
Wages, salaries and benefits	$ 323,686	$ 285,535	$ 257,797
Share-based compensation expense	36,961	23,106	21,879
Buildings, facilities and technology expenses	88,852	73,490	62,755
Travel, advertising and promotion expenses	38,024	25,940	25,780
Professional fees	29,819	25,969	18,220
Other selling, general and administrative	22,591	22,163	23,860
Total selling, general and administrative expenses	$ 539,933	$ 456,203	$ 410,291