Property and Equipment, Net (Summary Of Depreciation And Amortization, Capitalized Computer Software For Internal Use And Unpaid Property Equipment Reflected In Account Payable And Accrued Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 96,746	$ 92,376	$ 86,095
Unpaid property and equipment, reflected in accounts payable and accrued liabilities	18,334	19,326	13,343
Reagent rental programs
Property, Plant and Equipment [Line Items]
Rental and operating-type reagent rental program instruments transferred from inventory to property and equipment	17,407	11,628	9,645
Capitalized computer software developed for internal use
Property, Plant and Equipment [Line Items]
Capitalized computer software developed for internal use	$ 20,329	$ 14,753	$ 18,472