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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
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization expense | $ 78,495 | $ 74,208 | $ 73,797
Unpaid property and equipment, reflected in accounts payable and accrued liabilities | 24,688 | 17,894 | 11,744
Reagent rental programs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Rental and operating-type reagent rental program instruments transferred from inventory to property and equipment (Note 3) | 14,498 | 20,360 | 16,313
Capitalized computer software developed for internal use |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capitalized computer software developed for internal use | $ 20,130 | $ 17,115 | $ 16,131

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