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, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 92,376	$ 86,095	$ 78,495
Unpaid property and equipment, reflected in accounts payable and accrued liabilities	19,326	13,343	24,688
Reagent rental programs
Property, Plant and Equipment [Line Items]
Rental and operating-type reagent rental program instruments transferred from inventory to property and equipment	11,628	9,645	14,498
Capitalized computer software developed for internal use
Property, Plant and Equipment [Line Items]
Capitalized computer software developed for internal use	$ 14,753	$ 18,472	$ 20,130