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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Property, Plant and Equipment [Line Items] |  |  |
Depreciation and amortization expense | $ 74,208 | $ 73,797 | $ 63,537
Unpaid property and equipment, reflected in accounts payable and accrued liabilities | 17,894 | 11,744 | 10,601
Reagent rental programs |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Rental and Reagent Rental Program instruments transferred from inventory to property and equipment (Note 3) | 20,360 | 16,313 | 18,324
Capitalized computer software developed for internal use |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Capitalized computer software developed for internal use | $ 17,115 | $ 16,131 | $ 15,590

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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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